I'm just starting down the Pinterest automation road and setting up my accounts with what I would consider very conservative settings to start out.
Only repinning 1-2 pins per board for the first couple of days I setup the account. Then turning on the Follow module after the first couple of days and only following 1-2 people in the first day and adding 1 to my max follows per day. After about 2 weeks or so, I'll ramp it up a bit, but going very slow in the beginning.
I've, also, set it up to only perform actions between 6am - 9pm.
I'm only on day 2 right now, so no clue how it'll work out in the end, but I think this will be a pretty good setup for warming up accounts.