Ummm, you sure you're ready for this?
You'll need two channels for the elevons, one for the flaps, one for rudder/steering, one for retracts, and one for throttle control. So that's 6 channels for the tx, with mixing capabilities.

As for the battery, with out knowing what's the "norm", it's hard to tell you. Running nine servos means you need to have a very stout bec in the esc for the motors, or a stand alone bec to handle the load.

As for an esc, we'll need to know are you going brushed or brushless motors, and exactly which motors and what size props, and how many cells in your pack.

You can run four brushed motors on a single esc, but not 4 brushless motors on a single esc.

And again as for the batteries, with out all your motor/esc/prop info nobody's going to fathom a guess on that one. Just not enough info.

Sorry.