I tried growing peas in the greenhouse this year to get an earlier start on the season. I picked my first actual harvest yesterday, which is pretty good for this growing zone. I'm going to have to try using tomato cages next time, this time I just used bamboo stakes and twine to hold the plants.
I have peas in the outdoor garden, they're about 3-4 inches tall right now. I didn't get them planted until almost the end of May. I should try germinating them like you said next time I plant them.