when you market - you want your own website - you can use wix.
on the website you would use a service you can use that accepts credit cards for 5 bucks a month irregardless of how many books get sold on the website. (i forgot the name of the service but its only 5 bucks a month sell one or two books and it pays foritself) THe reason is amazon takes 30% for books over 3 bucks and takes a whopping 70% for books under 3 dollars. So to get 100% you sell on your own website !!

you also want to get the asin number for 25 bucks or whatever it is now.

those two things are needed to sell your book on your own and to publish it on amazon. no asin number - amazon wont publish it. (80% sure about this)
=)