Hi! If I were you I would look for any similarities or associations with you mother tongue vocabulary. Or it depends what kind or memory you have? If it's visual one then make some cards with pictures. Or if it's easier for you to remember things you hear record the words and listen to them while you're on a bus or in a car. And other good thing is to write the word like 20 times or even more. Then your hand will know the movement of the pen on the paper. Sometimes to know how to spell a word I need to write it. Anyway, hopefully it was useful.

My version would be: Hi! My name is Melb and I'm from Ethiopia. I speak Amhari and English. I've lived in USA for many years. I've recently hear about this site and I've decided to join italki community. I'm in desperate need of someone,who could help me out with English grammar/ English (in general) (I wouldn't say English usage, so I could confidently write the whole page letter or email to my friend. Please help me.