help! im stuck using RM XP

Please sum1 help! im havin trouble on rpg maker xp. okay here i go:

1). after i put a chest on a layer and assign a item to it, i try testing the game and when i open the chest animation does not work plus also i gain the item, the gaining of the item is not a problem, it's just that if i open the chest again i get the same item... i can repeat this over and over again.... how can i stop this?

2). ok.. how the hell do i attatch my own title screen? it does not want to do it.

3) ive created a short film about my rpg im making using windows movie maker. the question is... can i actually use some of it for a begining sequence? will i have to change the file type? if so what programme do i use?

4). how do i go about attatching video files? (sorry for all the questions)

LASTLY....

5) how do i get rid of that annoying tree backdrop and change it when you test the game your making??

Please! Please sum1 help me.. im new at this stuff.