I agree to just start out with the full sized cage. If you have a petsmart in town they sell all things living glider cage 1/2 inch bar spacing.
I have seen you don't want to chase around a young glider in the cage, you will scare it, and it will become scared of your hands. We just put the pouches on easy to remove clips and take pouch and glider all at once. so it saves us from chasing to get it. We also feed treats from our hands, so they have NO problem coming to us in cage for a treat. BUT gliders can be scared for awhile sometimes so be prepared to take it SLOW.
Petting for a child is fine, MOST glider don't want to be held! We have one glider out of 8! that we can hold fine. The others are in different stages. Mostly gliders will jump and crawl on you, or hide and sleep in your shirt. They will sit on my arm or shoulders. But it will take time and patience and a good glider and owner for a glider to be ok with being picked up and held like a hamster. During daytime its sleeping time so they will want a dark place to sleep and during night time its exploring adventure time.
I would call bonding more of a TRUST factor, first they have to stop being scared of you and be ok with you, then they should be ok with most of your family. Then with bonding I think its more they want or like to be with you, so they are happy to jump in your shirt and curl up and sleep all day with you.
As for a 2 year old with a glider, gliders nails seem to grow fast and sharp, so without a good nail cutting your child may not like the glider on them to much and petting may be better. Also be careful at first, if your glider is scared he will BITE HARD, and 2 year old can be scared away by this, so give the glider plenty of time to be friendly and not bite with you.
ALSO..gliders can jump from person to person and thing to person, I had a 10 year old get freaked out by 6 gliders using him as a jumping poll in our glider playroom, he could not keep his eyes on all of them, and their constant surprise landings chased him away after 20 minutes.
A face hug is a gliders way of saying YOU ARE MY BEST FRIEND, it doesn't happen often but having a glider land on your face... well we got our second glider pair because sophie did just that to their 6 year old and he wouldn't touch her after that so they sold 2 gliders to us.
wow long post