I wish I knew....
1. FDM prints need so much sanding it's worth using as much SLA/SLS in your builds as possible as it cuts down you work time HEAPS
2. Consumer resin printers are sh1t. If you can afford a Formlabs Form 3+ or 3L, do it.
3. Reinforce everything with dowel pins / rods wherever you can, because 3D prints really aren't that strong.
4. Prusa Slicer if the best FDM slicer ever and I'll fight anyone who disagrees (kidding)