I play HC. An hour or two in a power leveling community will get you to 70. Questing all acts works and will walk you through the game at any lvl. A1 bounties on normal will net you rorgs, gems + cash to get going. Riftbot is a gem. R-rift is bulletproof now. Make sure you leave the trial at lvl 4 or so (extremely early) so the g rifts don't get too hard. Anything below 20 is doable by a reasonably dressed WD. WD (there are excellent builds on this forum) and DH (there' is an excellent build in the guides section, T6 cold m6 build, complete with support, groomed scripts etc) are the safest to bot, they have lil armies to keep them safe when they dumb out for a min every now and then. I don't bot over T1 or T2, Wayyy below where I would play manually. Chest runs rock as well, T6 and no risk..
Anyways, hope this helps
peace