i always sand the wood before cutting with 220. after cutting it doesnt take much sanding with 220 to get rid of any little fuzzies. ive never sanded edges after cutting. the blades leave a smooth surface. there have been times ive had to stop and restart a cut and a little edge is left. in those situations i used the blade still in the saw to file/sand/cut that part smooth.
as for staining, when i do decide to stain a piece i dont use the prestain conditioner. i find it a waste of money. first things first,though- i use oil based stains so my pre stain conditioner is mineral spirits. ill lay the piece on a cookie sheet and either spray or pour some MS on the piece. let it soak in for about 30 seconds to a minute, then take out ,set on rags.paper towel, and blow it off. then set it in a pan and use a brush and brush the stain on the piece. it usually ends up with all interior cuts filled to the top with stain. then take it out, set it on rags or paper towel, wipe down and blow out, then let it dry. i have a board with a couple nails in it i usually hang the piece on to dry.
for the most part,though, i only used boiled linseed oil. no conditioning required but i use the same method as i do for stain.