Hi gnarly and welcome
As you'll have seen if you've been lurking and reading, we all tend to have our pet theories and in any case what works for one doesn't work for another, so you'll need to experiment for yourself.
Having said that, PM + SP is a good starting point. As Alexis says, you may find that you don't need the SP. From what you've said about yourself, your T and DHT levels may not be very high anyway. However better to be safe than sorry in my view and I'd suggest taking both until you get past the 'bud' stage and then cut back the SP and see if you really need it.
PM dose on the label will probably say 2 x500mg per day. To get growth most guys need 4 x500mg per day, but ramp up to that over at least a couple of weeks to give your body chance to acclimatize. You may find you get headaches. If you do, cut the dose a little for a few days and then try again.
You will probably notice some sort of effect on your chest in a couple of weeks or so, but that isn't real growth, just fat moving around. Real tissue growth ( 'budding') can take as much as 3-4 months to begin.
Alexis mentions the feminisation of the brain and there is clearly some sort of effect on a lot of folks, but it ISN'T a foregone conclusion, I haven't been affected that way at all.
Similarly with the minor body feminisation effects, I haven't seen any of that myself apart from a slight slow down in body hair growth, and I've been on pm for 15 months now. Like I said, we are all different.
I've never tried spray so I can't comment on that. I have tried the cream and it did nothing for me ( be ware that it can bleach your nipples!) but others have said it worked for them, so again, you have to experiment.
I echo Alexis' comment about taking pictures and also, try to keep the same pose each time. Don't do it too often and also keep a record of your measurements, but again don't measure too often, because if you do, neither will ever show any change!

So, welcome on board and enjoy the ride!