First of all, you need to follow the rules of English capitalization an punctuation. Every sentence in English starts with a capital letter. Also the word "I" is always capitalized. It is enough to use one question mark after a question. It's incorrect to use six. Every sentence must end with a punctuation mark, most commonly one of the following: . ? !
And the answer to your questions is: as much as you can, and for as long as you can. I began learning English as a second language 47 years ago, and I'm still at it. There's always something new to learn, some doubt to clear up.