I hope to meet a couple of nice people up here to exchange linguistic advice and to learn a bit about foreign cultures. :D
Take care!

"on" or exlude the preposition altogether.  Die Präposition auf Deutsch ist brutal! 

also, "of" is optional.  Du darfst sie auslöschen.

Und, "a couple" bedeutet regelmäßig nur zwei.  So wie Deutsch?

(Die Sprache sind nicht wie einander.)

First English notebook entry: Introducing myself

Hey,
My name is Rimi and I'm a scholar from Austria who wants to learn European Portuguese as well as improve my English on italki. I am very pretty much into music and I play the guitar myself. If I had to name an idol, it would definitely be John Mayer because I absolutely adore his music style and him as a person. (If you don't know him, you should check him out!)
I hope to meet a couple of nice people up here to exchange linguistic advice and to learn a bit about foreign cultures. :D
Take care!

Notes: Just a couple tiny things, but all in all, sehr gut geschrieben. You almost hit the mark. "Pretty much" doesn't sound right, but "very much" means the same.