こんばんわ
わたしわとまです　　トマ　？
わたしわ日本語のがっくせいです。
こんあんいであう。

こおんあんいであうまなぶ日本語です。

When using the sound 'wa' as a particle you write it as hirigana は. This includes こんばんは.

トマ is correct, foreign names are written in katakana.

がくせい does not have a small tsu.



Not really sure what this stuff means. I assume you mean こんなにであう. This sounds really weird, I doubt you can use that phrase like that. I could be wrong though.

I was trying to say that learning japanese is hard
i got something like konnen ni ..

Easiest way to say this is:

日本語を習うことは難しいです。

in hirigana:

にほんごをならうことはむずかしいです。

It is difficult to learn Japanese.