aish1108 - 5:30 pm on May 2, 2007 (gmt 0)

I want to add a Forum to my Website.
I have a site which I have coded completely by myself using Classic ASP and Sql Server.
I have a shared hosting account on Network Soloutions, which includes an account on a shared sql server.
I do the SEO by myself and have about 4,000 unique visitors a day.
I don't know anything about forum software.
Any advice would be appreciated.
Some of my questions are:

How much will a good program cost? Is it hard to install?
Will I need my own Sql Server?
Do I need to be the full time moderator?
What about a blog? I don't PHP or mysql.
Do i need to switch hosting companies?