Like some other respondents i've never heard of anyone having to run in a BL motor, but it's well worth bedding in new LiPo packs to give them longer life.
For the 1st few runs charge at no more than 1C (i.e if you have a 5000mah pack charge at 5 amps or less), drive gently (no more than half throttle) and only use half the charge in the pack (so stop running when the pack is down to about 3.8v per cell).
This makes no difference to the performance but makes the batteries more stable and reliable over time. I did this when mine were new in October and they still perform and balance well (no measurable difference from new) despite being used almost every week since then.
Storage charging after every use also helps. Check out this article, it goes on a bit but is well worth reading:
http://www.rchelicopterfun.com/rc-lipo-batteries.html