[Marco van Herwaarden]

1. vBulletin offers 'Custom Profile Fields'. These are admin defined fields in the user profile. You can set if they are optional, required or required only at registration.

2. I can't give a generic answer to that, but i would say that is the minimum integration you would expect from an addon/hack.

3. If i understand correct, you want to use the vB user database for your main page, but you don't want to show the forum yet? If this is what you are looking for, then you can just not gove the link to your forum and set permissions not to allow any forum for regular members.

About assistence, this will depend on the modification you will be using:
- General assistence with vB by Jelsoft Staff comes with your purchase
- Most coders of modifications will give support of their work free of charge here on vbulletin.org, some will be more active then others. You might want to check the thread about the hack to see how good the hack is supported by the author.
- You can always post general questions here, most of the times someone who knows will try to help you
- You can post a Service Request for payed help with all aspects of running and maintaining your board here in our Service Request forum. You will have to negotiate a reasonable price.

Hope this answers your questions.