Welcome comma Tim. (Without the comma, of course, a poster is not welcoming you, but is telling everyone else to welcome you. Welcome, Tim. Greetings, Tim. Hello, Tim. Congratulations, Tim. Et cetera.)
As a grammar/spelling/syntax geek of the worst (or best, but probably worst) kind, I can't encourage you to ignore Jamey Bryan's first suggestion -- but only because, as you get older and start sending out letters seeking work (as a GCA or otherwise), you won't want people like me (not myself) and Jamey Bryan to have an instant negative brain-spark if you start a sentence with "Me and him" instead of "He and I."
Just FYI: Tom Doak's mother was the same sort of geek, if I'm remembering Tom's testimony accurately. My guess is that she passed it along to her son!
I can assure you, though, as others have, that you're nowhere near the bottom quartile here, grammatically speaking. A person could spend his whole life noting the abundant errors in the back-and-forth here (quite a few in this thread, already).
I wish you all the best of luck.
Dan
P.S. My advice to you, and to many other young people: Learn how to break your writing into paragraphs. So much easier to read, that way.
Oh, and by the way: Feel free to ignore the comment about ending a sentence with a preposition. Winston Churchill was said to have remarked that ending a sentence with a preposition was something up with which he would not put -- but, of course, he was joking.
Speaking of preposition jokes:
Did you ever hear about the young boy who, lying in bed, saw his father coming up the stairs with a book in his hands? The boy said: "What did you bring that book I don't want to be read to out of up for?"