In order to get your creation to fly, it first has to detect the ground. Firstly, you will need a sensor (obviously) to do this. Grab a sensor from your parts menu, and flip it on its side. Now simply copy the number configuration shown below onto that sensor to get one of four sensors you will need. In spite of popular belief, hovercars can function on just four sensors. How convenient!
Once you have done this, copy the same sensor three more times, but increase its output channel to 3, 4, and 5. Attach each sensor to a redirector disc to keep them aligned with your thrusters, but ONLY if you are making a larger hover vehicle that can handle the bigger jets.

Now, you can go about the final step in hover jets in several ways. For now, we'll use a series of scalables to get them to link up. Assemble a small rig to make sure your hover thrusters are aligned and centered with the ground detection.
Decorations as shown in the image or not a necessity, however they do help to improve the visual appeal. If your vehicle is still too heavy to get off the ground when these are inserted, try to duplicate all thrusters to give it more horsepower, or you can lighten the load with less dense materials such as oak or aluminum.

Once your hovering machine is off the ground, you will quickly notice a few issues. One is that it may not be the smoothest ride. We'll get to stability later. One way to level out your craft is to angle the jets on further redirectors, as seen in this closeup of a truck that I constructed using this technique.
For now, though, let's get down to turning and thrust. To get your car to move forward and to brake, simply add thrusters linked to the throttle and brake inputs on channel 0 to link them to the driver's seat. Easy enough, but what about turning? In order to steer, firstly make sure that your converted vehicle does NOT have an engine, since this will mess with input functions. Second, use the same close-to-wheel bearings as your drive thrusters and angle small rockets to the side. Set their inputs to steering, and test it out to see which one needs to be inverted on your front end. You can also do rear-wheel steering, however this will greatly affect your lane control.

Now you can turn and move forward, but your vehicle is still a bucking bull with no control whatsoever. That's where plane flaps come into play. To get it stable and to hold it still, you will need air brakes on either end of your truck. To get started, use some large plane flaps angled at 15 degrees both ways, and make sure you have two of them overlapping to get both inputs. You will need plenty of flaps, so go crazy as long as you can handle the brick count. My recommendation is for about 10 - 30 of these large flaps, depending on the truck's mass. Of course, being the clinically insane creator I am, I put almost 60 on this delivery truck.
Now, you can repeat the same number over again for the front and back sides, only this time use the small plane flaps to get them to fit your vehicle's width. How you go about their orientation is up to you, but once more I would suggest 15 degrees in both directions.
Once you have completely calibrated your vehicle to be stable in all directions, congratulations! You have officially completed your ekrano-car!