Bought a coin 4 years ago.
have address and identifier recorded.
we can move it from coinbase to the wallet, but we DONT KNOW where the wallet is housed or located.
-are we online / offline?
You are on a online wallet. Offline wallets are on your computer/mobile and you DO KNOW its location
-do we need to be off coinbase when btg drops on the 12th?
Whichever wallet says will give you free btg, you will need to store your btc before they freeze the transactions. When the fork happens, it will automatically award you a similar balance in btg, if they declared they will do it. Some were offering and some plainly said they wont include any fork coins. Coinbase was more in support of Segwit 2x. I dont know its stance on btg.
- how do we transfer from wallet to coinbase?
You take the deposit address from coinbase and enter it in the send address of your wallet. with the amount you wish to send and the fee to be paid to miners, which would decide its priority
-should we just get a wallet on blockchain and put it there.
Its a personal preference. Some use online wallets. some use offline wallets. and some only go for trezor/ledger.
-how do i access the bth everyone got in september and move it around? if we were on coinbase, did we get that free bth?
if you have bch balance and a receiving address for it, you can make the transaction happen. I dont know whether coinbase awarded free fork coins or not.
sorry for the noobish questions, but i am a n00b
Feel free to check again if I got any of your question incorrectly.