Good for you. Research a lot before starting.
I would recommend an all in one cycle support supplement like AI's cycle support or CEL's cycle assist, one if powder, one is capsule form.
In addition, a good multi, milk thistle (cheap, preload this instead of the more expensive cycle support supps), and EFA's
For PCT, from what I've read with HDrol (I've never used this BTW, only SD, and I always used a serm) you COULD get by w/o a SERM, but you should always have a SERM on hand. There's debate over which SERM to use, and everyone responds differently, but nolva/tamoxifen would be a good starting point, you could also look into clomid and torem. In addition to the SERM, it's easiest to pick up a package or all in one PCT support supplement, which is available from several mfg's out there. A favorite of mine is PP's TRS stack (pm a rep for a discount code). It's a bit pricey, but the TRS + and SERM is all you need.