Build a Website

Hello, i would like to make a CS:GO jackpot site like these: [login to view URL] , [login to view URL] , [login to view URL] I don't know anything about how to do the system, or how i needs to be coode and how to make the bots. I know Html/css 90% so i'm also ready to help build it up. I need 1 that know how to make the site work, it works like this: 1. User deposit there skins to bots inventory (User cann max deposit 15 skins and must deposit atleast 0.25$, if he deposit les the 0.25$ or over 15skins bot shall cancel trade!) 2. Bot accepts trade and put there skin(s) on the site's currennt jackpot, untill it hits 50 skins, or timer hits 0 (needs to start at 3) 3. The user get's a % of winning and when the jackpot it hits 50 skins, or timer hits 0, a RANDOM winner will be chosen (ofcourse will a user with higer % have a better chance, but a 2% would still be able to win) 4. All users that have deposited a skin, there picture will be placed in a spinning slider, that stops at the chose winners picture as on " [login to view URL] " 4. Bot send his skins + winnings as a tradeoffer to the winnner of the round - 5% fees as we take to the site. 5. A new jackpot opens, and it all repeats again.