Those sound like good plants to start with, though alfalfa isn't an annual, it's a perrenial with a long tap root, which makes it a great plant for your garden, but hard to get rid of later (if you decide you want to) I had a ton that came up in my garden (probably badly composted manure from the horse stables). I can't get rid of it--which makes it nice that I've now decided to leave it and use it to build the soil instead.
I'm in a similar situation, blank slate of land, nearly an acre and trying to decide where to start first. Unfortunately I can't afford a pdc right now, so i'll just have to see what I can work out based on independent study.
