My, my, you are hooked, indeed!
Ok, starting with the first post.
Check your reciept of whatTony sent you, see if he did send you a video tansmitter.
The GP3 will work for fpv, but the problem is, it wil be on a stabilized gimbal. What you want is the camera fixed on the airframe so you you can tell if you are leaning.
What most of us do is to get a good fpv dedicated camera and mount it onto the frame. Somethingl ike this;
http://www.securitycamera2000.com/p...AWOLF-HD-CCTV-Mini-Camera-2.8mm-Lens-OSD.html
Then you want to decide on a video transmitter and reciever. Here in the USA the most popular are 5.8ghz and 1.3ghz. The difference is, 5.8 gives you a better quality picture, but 1.3 gives you better range and can burn through a few trees and such that get between you and the aircraft.
Considering you are already thinking of toying with way points I would recommend the 1.3.
Now, you have to know that manufacturers of these vtx's use different channels, so it's important to have both the reciever and transmitter the same manufacturer, not mix and match unless you are sure that they do indeed match well.
Immerson is probably the most common, along with Bostec. I would recommend Immerson as you can get them easily and are very common just about everywhere. I use Bostec on 5.8, but I have a bad knee and have learned to never fly farther than I am willing to walk.
Ok, so now you must look at how much power they put out on the transmitter. This is measured in mW. The idea here is to never have the transmitter put out a larger range than your radio, so you will loose sight on your system before you loose control. This gives you opportunity to turn around when the video signal drops out and get back into range again.
Considering this, there are ways to boost the transmission of your radio signal by adapting a uhf system to your radio. This will push you out miles and miles.
You have a Devo system, from Walkera. I'm not familiar with this system at all. I have no idea how far you can fly out and still maintain contact with Devo. I use Futaba, and it's good to about a mile.
So let's start basic, not changing out your radio or modding it to uhf, I would assume you can consider a safe range of about 1/2 mile.
At this range 200mW will give you the range you need to match to your radio as long as you have better antenna's. 300mW is common, too, so let's assume your radio can push out to 1 mile, then 300mW for the vtx will be good.
Something like this;
http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_30_38&products_id=1016
Now, you need a reciever. These come in a single reciever and what is called diversity, with is multiple recievers. Diversity will give you the ability to get the best signal back from take off to destination if you mix the antenna's.
For a reciever, look into something like this, which is a single reciever;
http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_34_44&products_id=911
Then you need antenna's. The dipole antennas suck. For a basic system, like I'm describing, you want to look at something like this;
http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_45_52_100&products_id=552
Then, you need a monitor, or goggles. Both have their good and bad points. Goggles gives you a nice large display to see, but is hard when you need to take them off to see what the aircraft is doing. A monitor is great for when you need to see the aircraft, but the size is kind of small.
If you go with a monitor, you can get larger ones, something I'm looking into myself, like what truckers use in their rigs that run off of 12 volts.
With Immerson, Fatshark goggles are most common. Dominator series was the best of the Fatsharks, but they have since come out with their Agressor series.
I know nothing about Fatshark, I use AIO goggles, which will not work with Immerson.
That's about the basics, except for some cables and adapters. Just don't expect an hd quality screen, it's all analog, so think about ntsc quality.
From then on, things get as complicated as you want.
There are a lot of manufacturers of fpv tx's and the price varries widely. Lawmate is a good system, if you don't mind the price tag.
As for your gimbal, it will hook up to your WKM to stabilize, but the problem is WKM doesn't really do a good job of it. For my use, I'm happy, but if you are looking to sell pics or vids, then a better stabilizer will become necessary. Radian and a few others do a good job, but there really seems to be problems with all of them. Your radio does have enough channels to do whatever you want with the gimbal.
No, I don't think your flight time is correct. You must have done something wrong. Redo it again. You already know that with your first flight in the park you went into low voltage landing at 10 minutes, that sounds about right.
As for the other battery set, I suspect you have a bad battery. It happens. Probably worked just fine when Tony tested the system but something happened inbetween.
From your pics, it looks like those are Turnigy batterys? Not uncommon with Turnigy. I've got Turnigy myself and have lost more than I care to think about. I have since gone to their Nano-Tec series and have been pretty happy.
If you do start flying way out there, fpv or way point, then I would recommend getting a hell of a lot better quality of battery. GenAce is pretty good.