I bought a iflight flycat260v2 on auction and was looking to buy a remote. But now I’m trying to figure out what I need to build one.
We have a bunch of guides here on dronetrest, but the best place to start is by getting this Haynes Build Your Own Drone Manual book that covers all the basics you need to know about getting into the R/C drones hobby.
Unfortunatley I cant exactly answer your question as its a very long answer, hence why I suggested a book 
I’m looking for at least some instructions on how to put together a iflight flycat260v2
Here is a video that should help, its not exactly the same size robocat, but the principle should be relatively similar.