The question usually arrives in the wrong form: how much should I spend? The right form is: am I ready to spend at all?
Advertising does not create demand out of nothing. It amplifies what is already there. If you have an offer that sells slowly, ads make it sell faster. If you have an offer that does not sell, ads help you discover that quickly and expensively.
That is not pessimism, it is arithmetic. So here are the conditions.
Condition one: you have sold without ads
If you have not made a single sale by any method, ads are not the answer. It means a question is still unanswered: does anyone pay for this at all?
Sell to ten people any way you can. People you know, groups, direct messages, a small stall. Those ten do not just give you money, they give you real objections you can answer in the ad later.
If you cannot sell to ten people while talking to them yourself, advertising will not fix that. It will scale it.
Condition two: somewhere for the visit to land
Ads bring people. Where do those people arrive? If the answer is a social page whose last post is three months old, you are paying to deliver people to a locked door.
You need something that answers three questions on the first screen: what this is, why you, and what to do now. It does not need to be a large site, it needs to be organised.
If you are not convinced that matters yet, there is a piece on three reasons you need a website.
Condition three: you can measure
This is the one most people skip, and it is the one that makes money disappear without anyone knowing why.
Google states on its Smart Bidding page that to use Smart Bidding you need to have conversion tracking enabled. It names the strategies that fall under it: Target CPA, Target ROAS, Maximize conversions and Maximize conversion value.
Every one of them optimises towards conversions. If you never tell the system what counts as a conversion, you are running on half an engine and paying full price.
Before you start, make sure you can tell the difference between numbers that move and numbers that matter. That is covered in how to measure marketing results.
The learning period is documented, not folklore
Plenty of people stop a campaign after three days and declare it broken. That decision gets made before there is enough data to decide anything.
Google says on its learning period page that it can take up to three weeks, or one to two conversion cycles, for a bid strategy to calibrate to a new objective, though it can be faster depending on how much conversion data is present.
It also lists what sends a strategy back into learning: a newly created or reactivated strategy, a change to a strategy setting, and campaigns, ad groups or keywords being added or removed.
So every time you go in and adjust something daily, you are resetting the counter yourself. Patience here is not a virtue, it is a technical requirement.
So how much?
Start with an amount you could lose entirely without hurting the business, and let it run long enough to learn without daily interference.
The logic is that in the first month you are buying information rather than sales. Sales are welcome, but the required output is knowing who responds, at what cost, and to which message.
Do not split a small budget across five campaigns and ten ad groups. The data fragments, no conclusion emerges, and you end up saying ads do not work.
When to wait
Wait if your margin is thin enough that any acquisition cost eats it. Advertising does not repair the economics of a badly priced product.
Wait if you cannot answer messages quickly. The worst possible use of money is paying for someone to ask a question and then wait two days.
Wait if this is genuinely a weak season for your product and you can afford to. The same budget performs better at the right time.
But do not wait because you want the page to be perfect first. Perfect does not arrive, and waiting has a cost of its own.
Awareness ads and selling ads are different jobs
People often compare two campaigns that are not doing the same job, and then draw a conclusion from the comparison.
An awareness campaign buys attention from people who have never heard of you. Its natural measures are how many saw you, how many engaged, and how many came back later.
A selling campaign works on people who are already closer: they visited, engaged, or know you. Its natural measure is sales and their value.
The confusion comes when someone compares cost per purchase across both and declares the awareness campaign a failure. It is not failing, it is working on a different stage.
With a small budget, start with the second kind. Closer audiences are cheaper to convince, and limited money should go where the sale is nearest.
The honest limit
No budget figure guarantees a result, and outcomes vary enormously by sector, competition and offer. Anyone giving you a guaranteed number is selling you something.
Ads are also not a substitute for search or content. When the spend stops, the traffic stops. That is not a flaw, it is the nature of the channel, and the comparison is in does SEO take six months.
In short
Start spending once you have sold without ads, have somewhere for the visit to land, and can measure a conversion. After you start, let the campaign learn for a reasonable period before judging it.
If you have genuinely reached that point and decided to scale, the execution is specialist work. The paid ads section of the KF Agency blog carries practical guides with numbers for the Egyptian market, in Arabic. I am Co-Founder and CEO there.
If expectations are the real problem, start from ads do not work on day one and when not to do digital marketing.