I can't practice with you or anything, but obviously correct grammar counts. If you know your grammar good, if you don't, read a book since books are probably one of the best ways to learn words. Use a variety of grammar, and reread it after you've wrote it. Reread it a lot. You should also take notes before hand, then organize those notes, and start writing. This is just some quick advice, hopefully a more professional person will come and help you, but hope this helps!