Hey! I've actually already developed a CS:GO betting site, with all of the features you mentioned and more. So it would be no issue to help you finish the site and get you started! PM me to talk more!
Relevant Skills and Experience
HTML, PHP, SQL, Javascript, jQuery, ajax, Nodejs, XML, Actionscript, Photoshop, Illustrator, Linux, Steamauth and more!
Proposed Milestones
$200 USD - Start
$800 USD - Finish