Question about usermeta

Hi,
I’m a complete beginner as far as WordPress databases go so apologies in advance if ‘usermeta’ isn’t the way to do this…..

I have a membership site (uses Optimizepress) and once my members are logged in, I want them to be able to save data unique to them.

1. I intend on having 10 boxes each with a save button.
2. User will add an ID in each box (ID’s are just affiliate ID’s from elsewhere).
3. ID’s are then retrieved from the database to be displayed on the page below each box. EG: “Your ID is …..” (I understand I would need some sort of PHP echo command to retrieve data from db.)

My questions..
1. Am I right in thinking that usermeta is the place to store each user’s info that they save?
2. Will the database allow this? (adding approx 10 unique fields relating to the user)
3. Can anybody recommend a plugin that will allow me to do this?
4. Is this typically what a form is for? I have always understood a form to be for signing up to something.

I do not want to give users access to the wordpress profile tab. I will just display the info on a page.

Hope this makes sense. Like I said, this side of WordPress is completely new to me!