This sheet is only as accurate as the formula obtained in the wiki, but I've included the published margin for error there as well. The numbers shown should be self explanatory. If you want to use this, please just make a copy. I'm not sure if the formulas always carry over, but it's there, so really all you've got to do is type it back in if not. That main formula is really the only "difficult" part of making this, but I figured I'd share it anyway as I haven't seen it put up yet.

You can plug in your numbers for Gym Dots, Stat Value, Current Happy, Steadfast, Education Bonus, and Energy Used, and this sheet will provide you with approximate numbers for how much you should gain, including the error margin listed at https://www.torn.com/wiki/Fighting_Stats.

Some notes(which are also in the sheet):
1) Hank's Training Guide for Druggies; Premium Option #1 recommends 5 eDVDs, 3 xanax, 1 ecstasy, and 1 points energy refill
2) This results in 2500 each for 5 eDVDs, which is 12,500, multiplied by 2 with the ecstasy, for a grand total of 25,000 Happy, plus whatever you get from the property in which you're living.
3) Ideally you'd have 5025 base happy from a fully upgraded PI, but with that much happy, a PI is just bonus happy. That said, you'd still want to get into the best property you can reasonably afford.
4) Three xanax adds 750 energy; Starting your xanax stacking with a full energy bar puts you at 900 when you start your train, and the points energy refill bumps that up to a grand total of 1050 per session(one 900 point train, and one 150 point train)
5) Incidentally, there's a merit available for accumulating 1000 energy(the merit shows that this is "max" energy, so I'm assuming taking a fourth Xanax in an attempt to get there is probably a mistake). I'd guess you need to take some LSD to get there, but I haven't looked into it yet.
6) Total training cost is approximately: $16,795,000. <-- This number intentionally uses high cost estimates for procurement values, best case scenario is that your actual cost will be below this by a fair margin.