Building website - 开放竞标

I want to build a esports betting website that is linked to steam. [login to view URL] in this website users could use their steam account to login and link with the website. In our website we do not want the users to chose between team A vs B, we want options like for users to guess the final score of the match, the score of a specific player, or any other types of betting topics that we will come up with. Then the winner of the bet will receive an in game prize that we set up before the match began. People who play csgo or Dota2 usually use an in game currency called "keys" they are about $2 each, and both of these games uses steam to login. In the website [login to view URL] there are bots that run different steam accounts to trade with users when they bet (which is open source). We would like that implemented as well in our betting system. After the items are traded the website will update showing the users how many keys they have bet on which match and on what type of bet that they made(player score, game score, etc). Users could also view their previous bets as well. these are the main features, more might be added just giving you an outline of our website