Trying to create a bitcoin based webapp in python which takes BTC deposits. How would I use pybitcointools to implement this?

Trying to create a Bitcoin based webapp in python which takes BTC deposits (New to Bitcoin in general, but want to get involved).

Although I would preferably want to use a different address for each deposit, (I read the docs and found out how this could be done, but still slightly confused), I would want to allow for users to deposit back into their own wallets. Though I think I got withdrawals figured out.

I tried to understand the (Now unsupported docs) but decided to come here for help because I was still confused. How would I use pybitcointools to

1. Generate an BTC Address. (New address for each user). I believe I could do the below for each user. So this would generate a unique address upon the creation of each user for them to deposit to.

   my_private_key = sha256('I guess whatever I please')
   my_public_key = privtopub(my_private_key)
   my_address = pubtoaddr(my_public_key)
   

2. Accept a Deposit into this Address.

3. Return the BTC value of this address.
4. When the time comes, send the balance of this address to the users own address.