Few questions
 

A friend gave me the link for vbulletin and at the moment I use phpbb, but I got have people displaying sigs as they block posts from opening, and got to say vbulletin looks like it has more options etc.

My only concerns are

1. Would I need to start my forums from the beginning again id switched to vbulletin or can I transfer all posts to it, as have a very large forums with a lot of info I don't want to lose, and would take well to long to copy and paste it all to have it saved?

2. How easy is it to install vbulletin, a friend installed nuke plat for me on my site and of course the forums phpbb came with the install, so not got much idea about installing it and linking the forums with the main site.

3. Last one for now lol I have a theme I want to keep on my site, and at the moment the theme matches the main site and forums, will this theme work onto vbulletin or not?

If want to see my site at all, it's www.yahoowarez.com

Thanks for any help ;)

style porting between softwares is not automatic and would take significant work.

installing vBulletin is pretty easy. it's just a case of upload and then run a script.

data can be imported from phpbb to vBulletin.

Seriously? You're asking for help regarding a warez site?