Easy get a good radio this will stay with you all the way through the hobby and a 250 racer if thats what your heart is on , once you have the radio you can build or buy ARTF just add receiver and away you go , one transmitter 50 quads , or the RTF way is 50 quads and 50 transmitters to carry around lol
Hi the OSD and FPV depends on what volts they use FPV can be 12v osd up to 12v but your need to check your have the lipo and bec you can use when you know the voltage you need