First Time on-

Just picked up a 57 CJ, nice shape and had a full resto in the 80's
Spent a lot of time years ago in my best friends 53 and always wanted to get one of my own.

I have done a good deal of auto work in my time along with driving and racing but I know I will have questions as I dig into this.

To start..
It does not have an oil filter which is odd. I guess I can use the access from the sending unit and install as intended but is there something else out there that you would recommend?
Also looking for half doors but don't seem to be finding much.
My air cleaner is a top access oil and canister unit. Is that canister a replacement item?
Thanks for whatever you can share...