Advertising or promotion definitely requires a certain budget to advertise products to consumers. It depends on your budget because each type of media has different prices. On the other hand, you can try the Craigslist Posting Service if you wish to use an effective online advertising service.
For example, if you own a large company with a big budget for advertising, nationally, using TV as an advertising medium is certainly very effective. Conversely, if you only have a lot of capital, advertisements on the internet or newspapers that fit certain market segments, then this can be said to be effective.
So, from here you can judge your ad is effective in terms of funds or not. You can just do advertising on a large scale with high funds too, but the results may not be optimal because you do not advertise in accordance with market segments. Therefore, starting with the budget to be more effective, then you can judge what advertising media is right for your product promotion.