about non-profit group - membership fees

[Ward3res]

We are creating a website using Squarespace and we (meaning I) need to add in a way for us to have our members use Paypal to pay membership dues. 

I guess the first step may be to sign up our group using the group e-mail address, rather than my personal address.

Would we be able to capture name, address, local union affiliation and e-mail address in addition to the payment information?

I appreciate any suggestions.