Build a Userfriendly Website

I need a website which is user friendly and allows users to earn points for every activity of [login to view URL] certain points user will redeem those points to buy any item in store. To earn points in site ,i will have quiz competitions, Tech news, Puzzles, ....etc Example: [login to view URL], [login to view URL] ...etc Notes: 1. There is no need of payment gateway. 2. User friendly website. 3. Email delivery system required. 4. May possible to launch Android,apple apps to link it to site.(You must make site ready for that also.) 5. Milestones payable at 4 or 5 parts only. Quality work and less price bid amounts are acceptable. if bid amount acceptable then i will send further complete guidelines to bidder.