First notebook entry: Introducing myself

Hi, everybody. My name is Frederic and I'm from Guangzhou, China. If you wanna want to learn Chinese, I can chat with you and teach you. I also wanna want to learn English. Thank all of you.

Need to be more careful of your capitalization.  "Wanna" is slang.  You do not write as such in essays.  Perhaps in movie scrips for dialogs.  If you do, you will be perceived as an uneducated person.

First notebook entry: Introducing myself

Hi, everybody, my name is Frederic and I'm from Guangzhou, China. If you wanna learn Chinese, I can chat with you and teach you. I also wanna learn English. I thank all of you.

"Wanna" is not formal, but it's okay to use. It's better to say "want to." Please capitalize the first letter of every sentence and every "I" when referring to yourself.