help with script?

[Godsfist101]

hey guys, so im looking for some help from anyone at all. basically i found this: 

and ive been trying to replicate it for some time but im not that great from a coding standpoint. can anyone by chance help me figure this out (clueless) i would love to be able to sell from both a locked vehicle (or unlocked) and your backpack. any help would be appreciated.

[david]