Welcome to the community :up: !
I'll give you a little advice that hopefully with help you not make all the mistakes I made when I first started. (I still make mistakes but they are getting fewer and fewer)
First off I would suggest you get in the habit of becoming familiar with the
vbulletin manual.
Secondly I would suggest that ANYTIME you make changes, keep a copy of the original. (THIS IS VERY IMPORTANT) !!
If I can be of any help with the minor stuff, let me know. I'm decent with graphics but not very good with coding.