I think you'd rather grab a copy of Hitfilm while you can (basically in the next few hours!):
https://hitfilm.com/express/free
It seems simple enough to use, yet it is very powerful and lets you do really whatever you want to.
It's good that audio isn't important, cause that would open another can of worms...
Shoot FullHD. YouTube does bad things to a video, but the better the original, the better the end result (you will always loose quality though).
Practice. First alone, then with one helper, ... basically stuff such as is your memory card fast enough you should simply try out. Then focusing... practice practice practice. Try focusing on different objects in your room, move the camera around, focus on other objects, ... then try to focus on a person walking around, keeping him in focus.
Turn off SR, none of your cameras has decent SR. If you want to shoot handheld, put the camera on a tripod and hold the tripod in your hands. Problem is you'll need to have one hand on the lens to focus, unless you can/want to use a small aperture, such as f8. I personally love the handheld look that comes from a well stabilized camera, if it is appropriate, try it. It's not too hard to pull off. You can try actually walking with the camera, how well that works depends on how you walk and how heavy the tripod is. The heavier the better, if you can still hold it. That way you can also get around using an actual video tripod. What you'll try to avoid is those quick jerks, they will look awful. A bit of movement is IMHO fine, it just can't be too fast.
@Na Horuk: Is it? Fast frame rates don't make videos jerky, fast shutter speeds do. Low frame rates make videos jerky, fast makes them smooth. However, a low frame rate like 24 fps is what they use in movies, so it automatically looks more like a proper movie. Higher frame rates are associated with soap operas, and they have higher requirements in terms of set design, make-up etc. If you're shooting 25 fps, then 1/50th seems to be a decent shutter speed. If that is possible.
I don't think SD cards are a big issue, the two cameras in question take relatively small files. Even for the very high bitrate K-5 files from my camera a normal class 10 card is more than enough... and we are talking about 3-4 times the bitrate of a K-30.
The 18-55 is an absolute bitch to focus manually, it is much easier to focus with a shallow DoF (say that 55 1.4 at 1.4). The reason (I believe) is that a) these lenses usually have a long throw and b) you can see what is in focus and what not... say if you want to focus on the eyes, and the nose is sharp, you'll see the eyes are already clearly blurred out. Then you focus on the eyes, and you see nose and hair is blurred out a bit. If the area that is sort of in focus is much larger, you'll struggle because the resolution of the screen means you'll THINK it is in focus, when in the final video you can see the eyes go soft while the background is razor sharp. Even if the eyes are sharper than in the shallow DoF example, that may not look as bad cause there is no sharper point in the video anyway. It is more or less the sharpest point in the video, and thus doesn't look like an error/mistake. Or simply use an aperture where everything is sharp (it's good if you can predict the area the actor is moving around, if at all, and you can use the AF to make sure it is right (or zoom in)).
fuent104's list is very good. I'd add that movement of the actors is fine, even with shallow DoF, if you can practice that exact shot. If you know from where to where you need to pull the focus, at what speed, and of course your actor needs to move accordingly, always from the same spot to the same spot.
Low in camera sharpening, yeah. Also maybe try to reduce contrast. Get more range so you can grade your shots later (if you get Hitfilm. If not... you'll end up with a flat look cause I doubt Movie Maker can do it).
And finally: Don't forget to show us the end result
Ps: You can watch Film Riot. As much as possible. They have a lot of videos on angles, stabilization, shutter speeds, editing, effects, everything.