Why bother - plenty of HD knowledge on here.
There are various options for the side bags, but unless you are particularly brand conscious, these work perfectly well: -
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https://www.ebay.co.uk/itm/282890102466?hash=item41dd9066c2:g:4acAAOSwTfFbTevs
The tour pack will take any suitable size sports bag, so no real need for anything custom fit IMHO. Anyway it will leave room to tuck in some wet weather gear icon. Try & keep the packing relatively light in the TP, otherwise you will feel the bike wagging it's tail at low speed.
Highway pegs - I've got them on my EG, the bike came equipped already, but frankly I hardly ever use them. I did manage to dent my car with them though, as the bike settled on it's side stand when parked too close.
Mine has protection rails around the side bags, which have avoided a few potential scrapes, usually careless bleeders on ferries or someone throwing open car doors. I also have a TP rack, which extends the rear luggage opportunities if necessary - SWMBO finds it a useful hand hold when climbing aboard.