Nice Raleigh! (or it will be), Looks like a Worksop frame, 20-30 Tru-wel.

#1 Do a search on Cottered Cranks, you have to get those pins out to remove the cranks.

#2 Put the stem bolt back in, try to thread it back in partway and tap on it, it should (Hopefully) pop loose the wedge and release the stem.