How do I create the plans in whmcs and make them auto set up when someone pays?

you create new products and services and fill out the information according to what you want your prices and products to be... you also have to add 'servers' to whmcs with the info for whatever software is going to autocreate the product.

So i need to go to module setting and fill all that out right?

If you don't have a package set up in WHM then you'll need to fill out the fields in module settings to suit your plans. There are pretty good how-to guides in their wiki for most control panels http://wiki.whmcs.com/Server_Modules :)