Hi Matt,
Regarding question 1 - for a glossy sport jet - after flying at the field, you may notice some bugs or dirt over wheel areas etc. It's handy to have a packet of baby wipes and a waterless wash spray bottle to hand to do a quick clean down before heading home. Something like this:
https://www.meguiars.com/automotive/...26-26-oz-spray
At home then you can polish/wax the paint like you would your car, this can be made easier with something like this quik detailer:
https://www.halfords.ie/motoring/car...-quik-detailer
Question 2 - I like dremel diamond cut wheel for long straight lines, or else BVM carbide cutters for other shapes or stainless steel - a lot of guys recommended to me also.
https://www.dremeleurope.com/general...eel-354-ocs-p/
https://shopbvmjets.com/index.php?ma...roducts_id=146
Question 3 - nothing to add on top of the list you already have
Question 4 - I do the same
Just my 2 c..