Any ARTCC will be a good place to start. Know your airspace, map, frequencies, etc and you will be fine. And stop with the K crap IE KBOS, KATL this is not Belgrade or Montreal. Just like the metric system, we will revolt the new ICAO system.:crazy:what do the experienced guys think? you've got a few really busy airports like KDEN and KAPA but I dunno, is it too busy to start at?