There's so many ways to target your audience, my best advice is to set a 1 dollar campaign per day and experiment. See what gets better results. Try the different ad-formats. Try targetting countries, try targeting specific age or demographic, target a channel, target keywords, target specific videos, try to get your ads running for max 1 cent per view, target high CPM countries, target english speakers, etc etc. See what works, analyse the data and if you know what you're doing and you understand adwords (it's not very intuitive and a ton of options to target your audience) you take it a step further. When you got the hang of it, only then increase the budget otherwise you're just blowing cash with wrong settings