"Well, this is my first time here. I dont know nothing anything about this, but I do like the atmosphere and the bottom line of this "italki". My mother tongue is Spanish and I would like to improve my English. I need help. Who can help me out? English is kind of tricky sometimes."

¡Muy bien! 

Remember to capitalize the first letter of a sentence and the names of countries, languages, and people. 
In your second sentence you can either say "I know nothing about this" or "I don't know anything about this", but saying "I don't know nothing" is incorrect because it is a double negative. 

English is tricky, but you seem to have a good grasp already. Just keep practicing!