I don't start mine off indoors because my space is precious, and I found last year, by March, they germinated rapidly out on the plot. I have heard people sowing them in drainpipes, filled with earth, so they can just slide them whole pipe full of earth and peas out into the bed.
Support, I use twiggy sticks as I have access to MASSES! Seems to do the trick, so long as you have plenty otherwise they can flop around a bit. I am a tad generous with my sowing just making a wide 'trench' (not the word but for the life of me I can't think what I want to call it) made by dragging the flat of my spade along the bed, then I scatter the peas...about 5 or 6 in a row, sort of thing, all the way along the bed. Ooo drill, drill is the word I was looking for! Ha ;D. If I were to use canes, I would need loads to tie each pea plant in. HOWEVER, I am also growing Aldermann this year and they are tall peas, sound similar to bean plants, so I will be supporting them with canes.