I have been going through this recently and on a steep learning curve, still on this curve... so I am sure people who are more knowledgeable than me will also be along to help.
But this is what I have learnt so far:
There are a few basics to get right...
For now stick to H264 as H265 doesn't appear to be (well) natively supported and thus requires transcoding first.
Pick either 4K or 1080p, but remember that with 4K even if you don't want 4K video you can use this to crop/zoom in which is really useful.
Next is to decide on your shutter speed. If you are looking for a cinematic feel try 24FPS, but personally I find this too choppy when anything more than tiny movement is involved, so use 30FPS normally or 60FPS for sports (which gives buttery smooth shots and the added benefit of being able to slow down by 50% for slow mo shots).
Pick a suitable white balance, cloudy normally works quite well for me in the UK
You should really be shooting in manual mode which complicates things even more, but is worth it as the results will be better (in the end) and more importantly predictable. This avoids nasty exposure changes mid shoot.
In manual mode you are looking to have a shutter speed twice your frame rate. If shooting at 30FPS you want a shutter speed of 1/60 and if 60FPS you want 1/120.
The immediate problem when you first try this is that you will probably find it tricky to get hour shutter speed that slow. Even stopping down the lens to F11 (or more) might not slow it enough so you will have to invest in some ND filters (likely ND8 and ND16). One of these should slow things down suitably and allow you to open the aperture to a more preferred 5.6 or there abouts. You can tweak things slightly by playing with the ISO, but of course you want to keep this as low as possible to avoid noise.
I would start with these and see how you get on. It will take some experiment to know what settings are right for you and which ND filter to use when but the end result will be that you have complete consistent control.
Hope this helps.