If I were you would have posted this in the main forum,it gets more traffic. I doubt you will see this because it's so old but whatever...
Where are you located? There is a lot to know in this industry, especially the hydronic side of things, If you really are that green the only way you will learn is by experience which you will get a really hard unpleasant dose of if you pursue this on your own. I recommend that you get on with a reputable installation company and do an apprenticeship like I say there is a lot to learn that you cannot possibly get by yourself.
PM me if you need some help.
All things are subject to interpretation whichever interpretation prevails at a given time is a function of power and not truth. Friedrich Nietzsche