I've used two different versions, water based and oil based. Both are different but work pretty much the same way, depending upon what you have you might be able to determine the best route to go:
For water based suspended crystals: Use a minimum of 100-150mg 60 mins before training. Inject in a spot that you won't mind being too sore in. Some water based products will leave a sore spot for 2-3 days after injection. You can expect to feel like the weight you normally use is lighter and you should be able to get 2-3 more reps out of each set. Your energy will be higher and you'll require less rest between sets. It's a nice boost to say the least. Once you load the pin (let's assume you're using a 3cc syringe, and you loaded 2cc's of gears) pull back on the plunger to the 3cc line, switch the pin and keep shaking it as much as possible before injection. The crystals have a tendency to clog up the pin if it sits too long. This way they will be suspended as long as possible.
Oil based suspended crystals: Everything is pretty much the same except you will get a strange taste in your mouth (ask Saney about that) but it does everything the same without the sore spot from pinning. You can use a slin pin for this type as the oil is cut with EO and glycol most of the time and it thins the mixture out really nice.
Double up on your A/I when using it, it converts to estrogen VERY quick. If you use 25mg aromasin ED make it 25mg twice a day once in the AM and once in the PM.
I have personally used between 100mg - 300mg pre workout and think 150-200 is a good spot of guys our age.
Good luck!!! You're going to love it!