I'm sorry I missed the bit where you said he had bitten your son! It's probably fear as he's likely still a baby and not used to handling yet.
There's an article linked below about taming - it can take time and patience

I think the main thing though is he will probably start to have more natural hamster behaviours and instincts in his cage, with plenty of deep bedding, a nice big house that's dark inside (a shoebox house will do - you cut the base out of a shoebox, keep the lid as a lift-off roof, and cut a hole for a door in one of the long sides of the box - near the corner/end - so the other end is dark inside - light doesn't travel round corners

).
And remove the tubes. Cages normally come with tube blockers so you can seal the tubes off. The tubes are also an escape risk and some hamsters can grow quite large and get stuck in the tubes as well!
Many of us have been there! With our first hamster, the cage was ridiculously small (3 levels of smallness) and lots of external tubes. Our boy thought it was cool - the hamster didn't and got cage rage! Within two weeks I had done some research and upgraded him to a different cage and it made a huge difference

Depending on which cage you have, and where you got it, some people have taken a cage back for a refund to be able to buy a more suitable one. Even if it's been used. By just saying it's not suitable for a Syrian hamster. Unfortunately pet shops do sometimes give unhelpful advice when buying cages. It's a sale to them!
Syrian hamsters need something about 100cm long by 50cm deep by 50cm tall and about 8" deep bedding (6" bare minimum). It sounds a lot of bedding, but it works out economical in the long run because you clean out much less often and just do "spot" cleaning of the pee area mostly. Or some Syrians will use a litter tray to pee in with sand in, if you provide one

It usually has to be in the right place for the hamster to use it or they'll ignore it! A good place is their current chosen pee area. Although baby hamsters can take a few weeks to develop good toiletting habits!
It sounds very early days, and I'm sure it'll all come together soon
Hand taming a hamster can make life with your hamster very rewarding. Suddenly they will sit on you to be stroked or even go to sleep on you, and will be very easy to handle. It can take a bit of time and patience initially.
www.thehamsterforum.com