First of all, good job on your first entry!  You did really well.  There are only a few little things to look out for:

Always capitalize I when you are talking about yourself.
"This's" is not a word, you have to say "this is."  Contractions can be tricky.

When you write a title, the first letter of every word is capitalized except for "in," "and," "for," and "on."

My First Entry in English!

This is my first entry. I don't know what to write, but I'm trying. I hope I will have ideas for the next time I write an entry, and that I will do well.  :P
This is all for the moment.