allow multiple users to register?

[yayvb]

I'm looking to have a website where people can meet friends, and I want couples to be able to meet other couples too.

Sometime after clicking the user agreement button, I need to ask if they are a single person or a couple. Depending on which is chosen they will be prompted with 1 or 2 date of birth fields to ensure they are both atleast 18.

I will afterwards gather a couple of details from each, but I'm not sure how to do any of this, can someone please help me?

I'll send $20 to someone if they can help me with this one!!! I know it's not a lot of money but I have no job at the moment.

Another thing that I'll also want to know how to do if you can please help, is if they select single/couple, they should be able to later change it in their User CP.

If someone could just give me the basics here, I've searched far and low and can't seem to find really how to interract with the database. I try to find the code in the .php files that shows how rows are created, where data is inserted, etc. I would of course try to add a new column of data but I can't seem to find this stuff really.

Thanks in advance for any help whatsoever!!!