hey mate. I'm afraid there is no such thing as a "non-Vision v3" The latest version of the non-Vision series Phantom 2 is called the V2.0. Here are some other facts you need to know:
Your RC runs in the 2.4ghz range, as does wifi. this is the reason that non-Vision series P2's DO NOT use either the DJI App, or the gopro's wifi for fpv. (Vision series RC runs on 5.8ghz so that's why they use wifi in the 2.4ghz range for FPV/app). For this same reason the "DJI Wifi extender" is of no use to you, it only applies to Vision series.
So you need to add FPV equipment in the 5.8ghz range to not interfere with your 2.4ghz RC control. You can buy pre-made FPV kits but honestly you can build a better, cheaper system yourself. There is a stickythread in this forum called "lowest prices on fpv components" that is a good list with a lot of parts and links, I'll cover the most common options.
First you need a transmitter... common options are the ImmersionRC 600mW and the Boscam TS353 (400mW). don't make the mistake of thinking higher mW automatically means better performance - proper antennas make all the difference in FPV performance... more on this in a second
once you have your transmitter, there is a plug and play cable for each style obviously get the appropriate one for either ImmersionRC or Boscam. Plenty of videos on youtube to help you through the transmitter/iOSD/PnP cable part.
in addition indeed you want an iOSD mini so that you have telemetry info on your FPV feed.
now you need a receiver/display... again the common choices are the Flyslight Black Pearl displays (several models) and the RX-LCD5802. Be aware there is a known compatibility if you choose the IRC600 transmitter, the 32ch BP version doesn't seem to cooperate so you'll want either the RX-LCD5802 or the 7ch BP. If you choose ANY other transmitter there is no known issue.
now, antennas. if you want any kind of real range premium is the way to go, the kits from FPVLR give you a nice transmit antenna, and 2 receiver antennas... short range omnidirectional (pinwheel) and a long range directional (helix) for anything over a few hundred meters.
There are other peripherals you'll want but you have many choices, for example how you attach the display to your RC there are cool 3d-printed ones that are best in most people's opinion. There are also minor peripherals such as a quick release gopro bracket, H3-3D clip for securing it during transport, and others.
the stickythread will be a great resource for all that stuff. if you have any questions feel free to ask.
