Would need to know business as different portals work best for different services. You add products in the admin area by way of Product Groups, Products, and then configurable options.
Relevant Skills and Experience
Portals - WHMCS, Shopify, WOO Commerce
Web Design, Web Development, Shop/Ecommerce
WHMCS features inc - product config, invoice creation, promo, client management, email communication templates
Proposed Milestones
$125 USD - Install Shop
$100 USD - Custom Design Logo / Graphics
$25 USD - Monthly Fee for Use of Portal