Custom Fields in Add Thread

[get2sammyb]

Hi guys,

I want to place some custom fields in certain forums (not all) and am wondering exactly how I would go about doing this.

Firstly - would I be correct in just creating some new fields in my database?

Secondly - how would I go about showing these on the "Add Thread" page and showing their content on the actual post?

Thirdly - how could I make them specific to certain forums? By making a new theme?

Finally - how easy would it be to have an image upload custom field?

Thanks in advance,

Sammy.