Filming isn’t really just the same as taking skills.
A first question to consider is what your intended output will be; from that you can work out what video coverage you need so that you can get the desired output in the edit.
Where with stills it’s often possible to direct attention towards collecting a series of images each of which in some way sums up some aspect of the subject, with video you’re normally trying to collect the materials that will let you (your editor) tell a story.
So it’s normal to think about getting a good balance of material – wide shots, mid shots, close-ups of the action and people and events you want to cover, taken from varied points of view, height, angle. Then it’s usually desirable to collect a big number of “cutaways” – lots of little details that are happening at the same time as the main action, that you can use in the edit to help avoid unwanted jump cuts.
If you can’t handle a tripod for speed of coverage, then for video you are likely to want to stay pretty well exclusively on the wide angle /ultra wide angle end of your lens range, to minimise the often damaging effect of camera instability on moving footage (other than for effects shots). So you’ll be walking the wide angle in close for the close-ups – which will also help with focusing issues. I’m not sure how well the Mk 11 is suited to run-and-gun ; I think the autofocus doesn’t work well for video? And with the loss of the image in the viewfinder in live view mode, then something like a https://philipbloom.net/2009/06/23/the-hoodloupe-3-0-with-the-canon-5dmkii-and-the-zacuto-z-finder-v2/ might be the best single investment you can make. And you’ll want someone with you with the audio recorder so that you can get the shotgun mic up close to anyone you want to hear in the final edit. I’m guessing you’re going to rely on some kind of auto-syncing software to line up the zoom with the in-camera audio …? https://www.redgiant.com/products/all/pluraleyes/