Joomla Virtuemart Project

Our company has a Joomla website. 1) We need someone to modify Virtuemare to offer our product at different prices, depending upon quantity ordered. For example price for 2 jars is $26.75 each; price for 3 to 5 jars is $25.00 each, price for 6 to 9 jars is $22.00, and so on. 2) When the person is shopping on our site we want them to see a table with prices for all quantities. 3) Modify the user signup to allow them to purchase product without going through the signup and confirmation process. Use the information they enter to purchase product to sign them up. This is the first of many Joomla tasks. We have several Joomla websites.