Amateur Bucks and Spending Stategy

I'm going to stop levelling up after level 3 because I'm afraid I'll waste all my amateur bucks on levelling up and then not have any to craft with.
To see what other players are doing check the strategy guide

find the thread labelled tap ball q&a strategy center (it's an 8 page thread, but the OP has been editing the first posts to summarize known info like

winning one battle a day gets you a daily win bonus
the difficulty bonus and how it impacts payouts

and so much more