A very bare minimum for me would be two more 20A outlet GFCI circuits on the walls. (you probably have the bare minimum of one 15A outlet per wall now all on one circuit.) Three would be preferable. If planning on 220v, add those as well now before everything is finished. If there are no unused breaker slots on the panel, you may need to add a another small breaker box. If there is no lighting circuit other than the opener, you may want to wire in some 15A boxes in the ceiling for some 4' LEDS lights. If running surface wiring, the code inspectors may want it in metal conduit. (you should be able to run romex in the attic). I would check first if not hiring a licensed electrician.
For the drop down ladder, I would have it hinge toward the center (under the peak of the roof for stand-up clearance). Can't tell which way the ceiling joists run, but when planning it, have it drop down into a space that won't be obstructed by work benches or machines (like the area in front of the house access door). If you can do it where you can open it with the garage door up, that would be a plus, especially for access in the winter.
For planning purposes, be aware that the electrical code requires the breaker box area to be accessible from floor to 80" high, and 30" wide (the 30" doesn't have to be centered on the panel, but must allow opening the panel 90 degrees). I wouldn't plan on putting a work bench or fixed machine there.
Also for planning purposes, in the future you may want to park vehicles in there
, so you may not want workbench or cabinet on that section of back wall by the house entry door. (Yeah, I know it sounds crazy to put a vehicle in a garage, but now that I built my shop, I do put our trucks in the garage for hail storms, ice storms, hurricanes, etc.)