changing shopping cart

i have a new website and i do not like where my customers would have to search through pages and pages to get to the size of the product they are looking for. want to change how my customers can choose their product. basically see the product, chose the size and or color and check out. i am not sure if it the cart that controls that. need help so that the site can get up and running Work to finish Soon. Minimum Price with good Experience will be considered and selected for long term. Regards.