I need a Sensai!!!
I am late, but I would volunteer for the starters. What have you learned so far?
My recommendation is to start with Hiragana and try to write everything only in hiragana, not romaji (latin alphabet).
Please let me know if you would like to get more hints.
I wouldn't be a good Japanese sensei, but I can help you on your sentence^^
Sensai is correctly spelled Sensei and Konnichi wa is put together as konnichiwa.
wa by itself is used to connect nouns with adjectives and so on.
An example sentence would be <em>Watashi wa gakusei desu</em>.
Which is literally translated into <em>I am a student</em>.
I hope this helps.