Well this is fun, commenting makes me not feel like such a newbie!
All of this is contingent upon when you go mind you. Having never done it I would suggest April and keep a close eye on the weather and avy report. Also keep in mind that the weather can say no wind and jaybird and it could be quite the opposite.
1.)I snowboard in a sturdy pair of winter boots, so hiking in them is not a problem. I am a bit of an anomaly in that, but I have never liked regular snowboard boots and they barely had them when I started. My buddy hikes with his and has no problem. It is a highway in the spring going up there so it's packed right down. Microspikes are a plus but not needed.
2.) The bag I would strongly suggest that you get a good daypack. Your set up sounds very uncomfortable. I use an ossprey day pack.
3.)Pack like you would for a day hike, just add a board. Unless you go when it's "winter" (in quotes because that could be in april) you don't need to go to crazy. Winter is a whole different ball game.
4.) No deep powder unless you go in winter and have a death wish. The sherbie trail to the parking lot is a fun run with some snow. Get there while the sherbie is skiing to the parking lot, beats walking down. FYI sherbie itself is a blast after a dumping, just don't go thinking your going into the bowl.
5.) that's up to you. I go light so I don't sweat out. Bring a winter set up especially if you go to the snowfields (Highly recommended, the corn is wonderful) near the summit. Just be smart.
FYI the boot ladder is a quick way to the top of the bowl, but a little dangerous. I would go right by lunch rocks and up that way. Boot ladder is scary. Someone let's loose is front of you and your in trouble.
Thats the newbie report. Like I said be smart and don't go until the snow has consolidated and the avy report looks okay. Have fun and be safe