Today is a good day to study English.

Today is a good day to study English[1], because it is snowing today[2].
I feel too cold, thus i don't want to[3] go outside.
However, it seems I got the opportunity to study English.
Hang in there!^^

Always use a capital letter at the beginning of a sentence. Especially when you are using I. The pronoun I is always capitalized.

[1] When two sentences are related like this it is better to use a comma.

[2] Try not to repeat yourself too much

[3] "Wanna" is slang and not professional, feel free to use it in IM conversations and when talking to friends, however.