Posted April 08, 2012
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Once you are familiar enough with the game, then Total Warfare is the next thing to get. This is the complete "tournament" rulebook, it has rules for all the common unit types, all the common weapons, buildings and a whole lot more. This is the level of play that most people seem to prefer, it has a lot to offer, but is not overly complex. Then there are expansion books for this, that introduces new rules, concepts and advanced equipment, though I would not recommend getting any of these expansion books until you are very familiar with the rules. There are also a lot of other expansions out there, but exactly what you want or need is up to you. With Total Warfare I would recommend buying some record sheets (that is the stats for the individual mechs, vehicles & infantry types, you get plenty in each record sheet book, enough for you to only really need 1, but more is fun ;) ), 3039 is the easiest era to get into, as you don't have to deal with a lot of the more esoteric tech.
Battleteh is by the way the most complete game I've ever played. There are rules for space battles in it (really detailed ones, dealing with ships from the lowly fighter up to huge carriers and capital ships), rules for ground battles (dealing with mechs, infantry, tanks, regular vehicles, civilian vehicles, artillery and more!), naval battles (ships, submarines, scuba divers) and air battles (airplanes, aerospace fighters, helicopters) and also rules for what happens when units ends up in an environment that they were not made for (what exactly happens to a mech who gets submerged under water when it starts to leak?). Though a lot of these rules are optional/advanced, so don't get scared by the scope of the game.