YES! a new player! w00t!
so lets see about those questions,
First, warmaster is a great game and WELCOME!
Dwarves are a great choice in WM, because they move just as far as normal infantry! but i would not use artilery, theres an article
here that gives a radical style of play that actually works pretty well.
I've seen it played and damn! is it good! Just watch out for cav. charges!
personally, i play high elves, and empire, (and have a chos dwarf army in the making!)
happy warmastering!
Mumba_jumba