For training at 55 you may still be able to use rotworms...but your best bet is a hole under a tree to the east of dwarf bridge. Once you go down the hole head north and into a sewer grate. There are slimes there and the northern part of the room makes it so that only one can hit you.
8-20 Try the amazon camp north of venore. Venore. Loot the protective charms to sell on the market. Once you've hit level 20 you will have plenty enough cash to gear up.
20-40 dark cathedral, dwarf guards, under mnt mount sternum, shadowthorn (loot holy orchids),
40-70 previous spawns are still usable, but at this point you can add orc fort and venore coryms.
70+ carlin/kaz dragon spawn (not super new but new enough that alot a lot of people don't know about it)