Confusion in Setting protection for One Time purchase and recurring incremental purchase pricing

Hi

I am using Paypal as the payment processor.

I am confused about two things:

1.I am offering two pricing plans: a) one time purchase cost for one single product with lifetime support through xenforo integrated plugin b)One time purchase cost for all products at the same time with a some recurring monthly fee.If the user stops paying the recurring fee then he will get access to lifetime support for all the products added until he payed the recurring fee but no access for upcoming new products.

I want to know how can I achieve the above 2 functionality in amemeber.

2.As you can see we are using recurring payments through Paypal how do I configure amember to collect recurring payment.Further if a customer wants to update his credit card info so that his recurring subscription doesn't stop, what do I need to do.