I just cashed out 3300$ worth of BTC via bistamp.
I am wondering if mining is worth it and where I can start.
[...]
From what it sounds like, you've already made up your mind that mining isn't worth it (at least subconsciously).
To spend $3,300 on mining gear, you'd have to look at how much Bitcoin (or altcoin, but lets keep it simple for now) revenue that equipment would generate. Think of it this way; if $3,300 can get you
BTC5.0 (@$660 on an exchange), what equipment is out there that can generate more than
BTC5.0 over time (after operational expenses)? For the most part, the smarter play is to invest in Bitcoin directly unless you have access to cheap power / low cost hosting.