The Blue Raz starter kit is a great place to begin. This kit comes with everything you need to make a 16oz jar of sea moss to take plain, add to smoothies, or add to your tea. 
 
The biggest worry about buying premade sea moss is whether or not is going to be shipped correctly. Nobody wants to come home to a package of warm sea moss. 
 
Depending on how you like your consistency this kit will give you 16- 24oz of finished product. There is an extra jar in the kit for leftovers to freeze or gift to a friend.