1st time

It's the first time I have decided to do knowledge learn with a stranger to with the aim to of learning their language, habits, etc. I think this can could be so very interessing and rich rewarding (rich doesn't sound right)! I am so excited to speak with my first person!

This is not bad at all, well done! Good luck learning English.

1st time

It's the first time, I decide to do knowledge with stranger to the aim to learn their language, habits, etc ... I think than can be so interessing and rich ! I am so excited to speak with my first person !

It's the first time for me to exchange information with a stranger having the goal of learning their language, habits, etc. I think this can be interesting and enriching. I am so excited thinking of speaking with the first person.

1st time :

It's the first time (no comma here) I have decided to do knowledge with a stranger to with the aim to (in order to) learn their language, habits, etc ... I think than this can be so interessing interesting and rich ! I am so excited to speak with my first person contact/speaker !

I hope  a native speaker will give his opinion :)  , good luck :)

1st time

It's the first time, I decide to do knowledge (qu'est-ce que tu veux dire??) with strangers to the aim to learn their language, habits, etc ... I think than it can be so interessing and rich ! I am so excited to speak with my first person (ca n'a pas de sens)!