Paid online marketing works only if you define the right KPIs and track them constantly. Learn & get used to track your numbers before scaling.
Set your goals first & Make a realistic plan and develop a Data Driven Strategy. Define your goals based on your own Data, not based on luck, hope or random advice.
Define how much you are willing to spend on each platform and what the expectations are. When allocating the budget, you have to be aware of your customer journey.