You shouldn’t need any additional treatment to the surface when printing PLA or ABS… Ninjaflex may require a gluestick or something, but don’t quote me on that. Lulzbot has guidance on filament specs, but I can’t seem to locate them at the moment. The following has some information about the different materials.
As a rule of thumb extrusion temps are marked on the filament spool, or on the manufacturers website.
Bed temps vary from material to material. Always let the bed cool lower than 60C before removing parts… this seems critical to the adhesive bonding the PEI to glass.
I only print in ABS, so can only provide experiences with the material. I like a bed temp of 110C for the first few layers, then something like 90-100 for the rest of the object if your slicing software supports mid part temp changes. Leaving the temp at 110C, can scorch the part if its a light colored filament. Remove parts at ~50C. If you find yourself prying on the part too much, try a few drops of IPA around the object… LB sites that alcohol can prematurely dry out the PEI, but others have countered that… so do it sparingly. Once you get that part off the bed, give the Z-endstop a quarter turn to raise the nozzle higher.
Hope that helps.
EDIT: Found that page with recommend temps: