Ok, it does sound like you need an E-commerce sytem but you can also combine this with a CMS as well.
The best E-Commerce Sytem is OS Commerce, check Wedding bridal jewellery accessories.
as a good example.
When it comes to CMS systems there are some great ones out there but the most simple one is CMSMADESIMPLE, it's a great program, check Avoca Beach Home and Online renting property script - 24 hour startup, flexible licencing options, good luck.