Here is just a simple outline of what you would probably need:
Recovery Questions: There is most likely not going to be any on the account, but if you can remember old ones, insert the answers into the boxes anyway.
Membership Information: Little importance as it's easy to lose + can be set by anyone, although it may help.
Contact Information: Medium importance, put earliest contact information known for the account.
Passwords: First or second password is a must have. Jagex is pretty damn strict password - wise. Make sure that you have the earlier passwords in the boxed, not your most recent ones.
Contact Information: Must have the created year and the location + one ISP box correct. This is needed for a successful appeal.
Similar IP: Appealing from an IP similar / a country similar from where the account was created helps the appeal a lot. Appealing an account that was made in India from Australia wouldn't help your case at all.