Connections for controlling 4 dc brushed motors

Hi, i am working on a 4wd robot chassis which uses 4 12v Johnson grade A dc motors and it does not have encoders. I wish to control this setup using the rc transmitter a nd receiver i have, namely, (FlySky FS-i6 2.4G 6CH PPM RC Transmitter With FS-iA6B Receiver).

My question is if i am using a motor driver like cytron md30s or mdd20a, what should i be connecting my receiver to? Like i also wish to keep my raspberry pi connected for later use. Is a pixhawk flight controller is what i need? Since i wish to use ardupilot later for developing gps based movement.