yep studs finger tight just.
smear (finger wipe) a little oil around the gasket face, same idea as oil filter gasket.
id start with nut in middle then work my way out, same idea as head bolts though its not too big a deal as its only 10nm you are applying
paint, id probably just use Hammerite but im not too offey with anything else - ive only hammerited blocks & calipers before etc and paint has held up rightly. just make sure its well prepped for paint