I'm not ( and I doubt most people won't ) be able to tell you what you will need for this idea you have. My last post was just to give you information that you should consider while making your own decisions about the direction you want to try and or take. Don't expect to find a list of steps to address all of your requirements you need, I believe your situation is unique enough that you will need to design the solutions yourself to fit those needs.
The first post with the search link I made, is where I'd suggest you start. You can look at what others have designed and talked about. If you have almost no dexterity with your hands, this will make finding a solution pretty difficult since most directions will require that. Some of the solutions found on Amazon did allow use of a smartphone or tablet for control, perhaps something in that direction could be a consideration although I'm a bit doubtful based on your description you gave.
While range may not sound like a potential problem, the obstacles between where you are located and the vehicle is at, can not be ignored even if the distance is low. Just driving around a refrigerator, as a simple example, could block the radio signal. Video signals can be even more prone to these issues but if you have wifi, these can be worked around but would require additional access points if there are trouble spots.
So I'd recommend reading through the search results first. If you feel controlling it is the main issue at least read what was posted already by others and also consider the points I mentioned so you can at least avoid issues others have found or considered. You at least may find answers to parts of the solution across the various ones others have had.
I also believe you'll may end up enjoying the research itself as I know I do when I have to overcome an uncommon issue. I'd probably suggest also keeping a list of the URL's ( web addresses ) for potential solutions to some of what you are looking for so you can refer back to them later.
I'm going to skip over suggesting a controller since your situation isn't something I can make a good suggestion for directly. I will say until you select one, don't worry about getting the other items yet. That won't stop you needing to research the other things, it just delays getting them until later.
When you get to the point of selecting a vehicle... Look for ones made more for rock crawling and being able to get over potential obstacles. These are typically not fast but have more torque and power for those situations.
RC radios ( in the USA at least ) are divided into two categories so they don't conflict with each other... air and ground vehicles. So if you purchase these separate from the vehicle, just take that into consideration. Ground types are further divided into two styles... the trigger/wheel controller I briefly mentioned and the joystick type. I'm not certain that either style would work for you but still good info to remember. Radio brands like Futaba, Hitec, Spectrum and others ... use different radio protocols. That means that one brands products won't work with another brands product because they "talk different languages" ( so to speak ). There are some off brand products that do multiple protocols also. This just means the transmitter and receivers must use the same protocol when you are selecting them.
We may still be able to help with some of the questions you have if they fall into categories we do have experience in. So if you have a question about a typical RC related thing... do feel free to post and ask about it. We are not opposed to questions beyond RC either, we just may or may not have any experience with those subjects... but we are full of opinions.. lol
killercripple to the site. If you have FPV goggles with head tracking you'll be able to look around while driving but i'm not sure about controling the rc car with a pc. Here's a video that might help some...I hope. 