For 8.5 foot ceilings, definitely go with flush mount. 4' LED style will work well for you.
I'm a fan of white light, especially in a shop. And you just about cannot have too much lighting. 5000k or higher color, and you want somewhere in the 100 lumens/ft2 range IMO. If you have an area that will have something like a work bench, welding table, or similar you may want to add an extra fixture there. Eliminate any dark corners or spots on the floor. Again, it is almost impossible to have too much light but it is very easy to have not enough.
Also, think about how you will wire it so you run your switches and circuits the way that works best. My shop has two rows of lights running the long dimension, so each row has its own switch. My office room has it's own separate switch, the lean too on the outside has its own, the awning over the front is on it's own and the gable lights each are on their own switch so I can turn whatever on or off as I need it.