I have zero knowledge of your area, however from a general viewpoint crampons are used once the slope gets too steep (35-40 degrees or so) or when there is not enough snow coverage to use snowshoes-- again this is just a very general idea as I have many times used snowshoes all the way to many summits in Colorado, you will certainly know when slopes or the terrain just gets too much for snowshoes.
My advise is too practice putting on, taking off and walking in crampons before you venture out into those types of circumstances. Find a climbing partner, look on local forums or meetup.com and get some lessons from those people on crampon and ice axe techniques before you are in a situation were you actually need to use them!
Again, very general but I find myself wearing snowshoes pretty much up until treeline and then I switch to crampons and don't switch back until I am back at treeline. I can't think of a time where I have switched between shoes and crampons multiple times on a single trip.
Avalanche conditions-- take a basic class or two at the VERY least! Look at your local REI-- here in Colorado there are free Avalanche clinics every so often during the winter at REI. Look for local climbing clubs that may also put on avy clinics for you to attend. As for gear: Shovel, Probe and Beacon-- however if you go solo the last two are irrelevant because if you are caught in an avalanche in the back-country with no one around they become useless. A shovel is always good for digging snow pits to evaluate conditions which is what you will learn in any credible avy class. If you get really serious, then I advise you to take a certified AIARE Level 1 course-- they are well worth the $150 or so that it costs.
Also pick up a copy of "Snow Sense"-- this should be in every backcountry winter enthusiast's book collection.