So glad you came here with your considerations for sugar gliders as a pet!
I'll do my best in answering all your questions, some people have different opinions however.
Sugar gliders can bite wires, they may or may not, depending on your glider. Imho, I recommend getting to know your gliders a little before giving them run of your bedroom, even if glider-proofed, due to it's larger size.
Some tips and suggestions, along with some things I did.
a. pouch time visits during the day. If you can't glider-proof a smaller room, s/a your bathroom, then go ahead and do this in your glider-proof bedroom. 1.Close the door to room, just in case. 2.take the pouch out with them sleeping inside, slowly and gently. Talk softly to them while doing so. 3. hold pouch in hands, cradle it, rub or gently massage them from the outside of pouch. 4. have treat ready to hand feed when they pop their heads out. 5. give gentle head scratches/rubs when they are munching on treat. *if in your room, you can do this while sitting at your computer.
This is how I started, my girls were in my spare room at the time, but I spent a lot of time in there with the computer, exercising, or hanging/folding laundry. I also began trimming their nails in that room.
b. "out of cage visits" are best early morning, but you can from late evening to late night depending on your schedule. It should be done in a secure, glider-proofed room. If you must, use your bedroom to start with. I used the spare room before setting up my bathroom to be play area for short out of cage visits. Just be careful and focused on them, trying to keep them on you or close by. Using a smaller space, as I already mentioned is ideal, but yes, I have had my gliders out in a room with my computer, very, very supervised and then after I knew them a little better. This was with past living conditions, so now they're back to highly supervised out of cage visits in my bedroom, where their cage is currently.
I hope this helped answer your first two questions.
Suggestions for room set up. Bare room is good for gliders, helping you see where they are. I recommend using a red bulb in a lamp, so you can visually watch them without bothering their eyes or playtime.
a. As mentioned, I have different living conditions now than before, I take a fleece throws (with thread boarder removed). I lay one folded on the floor to help protect my floor from their mess. I also have a closet curtain (like shower curtain) instead of closet door. My room is small and crowded, so I place the second fleece throw over my bedroom door, draping it so it hangs long and rippled (loose) down the inside of door and enough over the door so when I close the door, it secures it firmly, creating a fleece wall. My gliders jump from me to fleece wall, climb to the top and jump/glide down to me. They also sometimes jump to my closet curtain. If you have a closet door, see if you can secure a fleece throw/blanket to your closet door as well.
b. I also have a wood platform attached to the outside of the cage, as well as one on the door. They can sit on these ledges and jump to me and back, they will also just jump onto the cage.
*I've had my gliders for a few years and I am pretty good at keeping my trio contained to this one area of my room for out of cage visits. It gives them a little outing, exercise, and relationship building that seems to satisfy them. However, if I could take them into another smaller room, s/a the bathroom like I used to for really good run-around and explore time, I would. I have to be very careful, but knowing my gliders and them knowing me helps because my room has a lot of spaces they can get into and be hard to get to.
As for them knowing what they can jump to, my gliders have tried to jump on things and slid off, so I'm guessing they just wing it. :)