This is a good place to hook up with people, but it is going to be another month or so before that starts happening around here.
The Clear Creek playpark in Golden is a good place to meet people, especially if you are relatively new to kayaking, as you say you are. Various sections of Clear Creek are pretty much THE weekday run for most Denver metro area kayakers.
Start hitting the playpark as much as you can as soon as it starts getting around 200 cfs and you will meet a ton of beginner/intermediates and maybe even some experts who would like to run some easy stuff with you.
Clear Creek doesn't really have any easy sections in the main part of the canyon, but you can chop off the last mile and do from tunnel #1 to town for some class II/III. It is only a 1 mile run but it ends in the play park so it is fun for beginners.
The best early season easy run close to Denver (in my opinion) is Waterton Canyon. There are usually a ton of intermediate level paddlers heading up there early and there are other easy options on both the north and south forks of the South Platte River upstream of the confluence that is Waterton Canyon.
I'd probably save the rest of Clear Creek up the canyon for when you are comfortable in class III+ and are starting to think about IV. When you are at that point, start running the "upper" run or the "lower" run at about 300 cfs to see what it is like. Both of those runs are probably III/IV-/IV at low flow but they become solid IV and even IV+ with some juice. The middle run is Blackrock and that will be for later, when IV is easy for you.
I like taking newbies down Clear Creek once in a while to try to bribe my way into heaven with some good karma so I'd be happy to show you the rest of Clear Creek, beyond tunnel #1 when you feel ready
Get a river knife and fasten it to your PFD now. Get throw bags and whistles before you leave the playpark.