I am confident I have a good backup of the .json wallet file. What I think I
need is my recovery key, just in case, can I get this from my old wallet once I
login?
If I do find my recovery key can I use that to recover my account on another computer if need be?
The full client does not use recovery keys or a brain key.
All you need to recover your funds is the wallet backup file and the pass
phrase.
Do you know if the owner_key fond on the file I mentioned earlier is the key I
need to recover my account?
Usually you can recover access to your funds from your owner key.
You may need to run
wallet_regenerate_keys <accountname> 10500and rescan the blockchain, but with the owner (private) key you can in most
cases recover your account and the funds.
The only cases where this does not work if you had changed your keys manually
and received funds afterwards (I would doubt that)