Trying to figure out where to start

Nope, just work through the wiki, take it slow, read it all. Then go back and read it again.

On these forums, single/dual antenna only refers to how many antenna are mounted on each tractor (rover).

The rtk will come from either a base station you build or, depending on your location, a service you subscribe to. The base station also has an antenna but it has nothing to do with whether you use a single or dual antenna set up.

Ok, im working on ordering a pcb. What does shortfall mean? And does the list of unavailable parts look doable?

How does it look?

One thing that concerns me, i see that it has spots for 2 f9p, did i click the wrong file? I am planning a single antenna setup with imu/bno085 and WAS running on my own base station. Ive tried to study out that link that was posted on here, it helped alot but i still have a few questions.

The All-In-One board was designed to work for single F9P/IMU or dual F9Pā€™s. The other F9P space is just left unused.

Got it, so does that look correct?