You want to tune it yourself? - Read up on Romraider, and nasioc and various other tuning guides. It's very in depth. Non turbo isn't so bad though.
You want to pay for a tune? - There are options for e-tunes where you basically deal with a tuner over email. Can also road tune in person, or dyno aka "pro tune" which is best. Prices range from 150 to 500 for a pro tune.
You will need a Tactrix 2.0 which goes for about 180 new and 120-150 used. But for a pro or road tune you probably won't need one yourself. And a laptop.
I've tuned my n.a car myself, which I found to very difficult, confusing etc. But I think with more experience it would become a lot easier. I wouldn't tune a turbo car myself yet. If you had someone to actually show you this stuff in person it would help 1000%. Reading about it and trying to do it yourself, first time with 0 experience is daunting. But I have a project car just for messing around with.