I would shoot a flat profile on the 5D then when you get to grading focus on luminance first and get those as close as you can, then get your saturation dialled in then tweak your colour. You will have the best chance making the 5D look great then getting the Scarlet to match that since the 5D will fall apart if you try and push it to hard but I have had great success matching the two in resolve so I image no problem in speed grade either.
Manfrotto is probably the best bang for the buck at this price range. 509HD or 504HD, depending how locked to your budget you are.
Canons are wonderful to learn on and are great cameras, I have worked with most of the DSLRs from the t2i to the mark3. 720p60 is there as an option if you need it, not great for green screen work even at the 5dm3 with all-i compression.
If you plan on doing a lot of green screen work you could look into the Blackmagic Pocket Cinema Camera. Not the easiest of workflows and not the cheapest option to get fully up and running but it will make green screen a heck of a lot easier and give you a better overall image. The smaller sensor makes it a little tougher to get big wide shots and shallow DOF but it teaches you how to accomplish both these things in different ways and really plan for them. Not the easiest camera to work with overall but great quality and very easy to key from.
Main thing is getting your lens in focus. Try shooting on full manual (M) set your aperture (f-stop) to something around 5.6-8, this will help you get more in focus while learning. Then set your shutter speed and ISO according to your light. Shooting a lower ISO will give less noise in the image, while shooting at a fast shutter speed will freeze your subject more so there will be less motion blur if things are moving. Double check your focus and shoot away! Play around until you get the hang of it. The better your lighting the better the photo will turn out.
most magazine stuff is shot with flashes and a lot of experience so keep working at it and keep playing with different settings and you'll figure out what works best for you. There is no right or wrong when it comes to how to do something.
Not exactly sure what you're asking. Make sure you are shooting and editing your video at 1080p. For best cinematic quality shoot at 24fps and keep your shutter at 1/50 (since it's the closest you can get to 180degree), this combined with proper exposure and lighting will create much higher quality. Then make sure you are exporting high quality 1080 or 720 from your editing platform and upload that!
Konova Slider is awesome, I have a 24" and a 40" version I think it is. Holds a good amount of weight and is nice and smooth and fairly light weight. The portajib traveler I think it is is a great portable jib, easy set up and being able to use the bag to hold rocks or sand as a counterweight can be really handy if you're hiking around.
LED panels are great, depending on the size you want to carry. I like to keep 1x1s with me but they are a little cumbersome but I keep 3 of them in a travel pelican case and can roll it around but not great for hiking around with, walking in town isn't bad but smaller panels would be better if your hiking. Bounce boards an invaluable when I'm hiking around, lightweight and can create a ton of light if the sun is out.