Magento to existing site

I have an existing site that need a shopping cart system, i would like to use Magento. I need the site to be converted to Magento for simple categories, sub-categories and products. Some features: 1. 3 Languages (English, Hebrew and Russian) - i will translate to the other 2 languages but the site need to have this ability (using dictionary file) 2. Coupons enabled 3. Mailing lists enabled 4. Another product called "Membership" when you buy it all other products have discount price (each discount product price is choosen by me)