This seems kind of like a backwards way to manage money. I know you've already said you're going to save up and that's good. But for the future, it's best to find what you really need and work out a budget for it, saving up for it if you need to, rather than trying to spend money just because you can.
If you spend on what you need rather than what you want, you'll be able to build a strategy, set aside money for it, and profit. What if you were to spend $10 a month on something just because you can, but then you find something for $20 a month that you actually need? Not only is your budget already tied up, you have to double your expenditure when you could have delayed your start, planned your expenses, and saved that $10 per month.
Besides, if you start spending small now any chance you get, you'll likely develop a habit for it. You'll spend $10 per month now, then your budget will open up a bit and you'll look for somewhere to spend another $10, etc. etc. However, this really limits you, because what if what you really need is one of the $50 per month services like drip feeds, but you never are able to explore the option because you're tied up doing a bunch of separate $10 per month expenses?
I don't know if you've ever played a tower defense game, but the goal is to build towers to shoot down various waves of enemies. A strategist will quickly find that buying many of the cheaper, weaker towers may work in the beginning, but in the long run, it's best to buy a few towers, save money, and upgrade them to be more powerful and efficient. This should be akin to your marketing strategy.
Anyway, depending on what you're promoting, you should research effective ways people are backlinking for comparable sites, then model a strategy after that, and figure out what services you can do now, estimate an ROI, and determine how often you can add additional services to your strategy.
