payment configure confusion

hi,

I really need some information on setting up a payment module for ZC because i am completely and uttlerly confused , after my initial experience. I should have come here 1st and couldn't delete my other posts.

I have created a paypal and sanbox account although the sandbox account can't verify me email address or send me an email.

q)Can I set up a payment module where the users (me) can enter in fake cc's to test ZC. Is payment express the easist and free or is there a simpler way. Ideally i want a test environment where i can enter fake CC's and stay on my site.

q)Do you configure just 1 type of payment module eg just paypal express or just yourpay but not both.

q)Is there a free option to do this eg paypal sandbox or something else? I have read that sandbox doesn't work with ZC and I have my ZC so far on my localhost.