Personally, I've never used it... though I'm planning to in the long run. On to your question:
Tren A, very strong anabolic compound that will help you in getting muscle mass/stregth as long as diet/wko regime is consistent and your putting in the right foods. 50mg is the norm for those doing first cycles. It must be injected daily and from experiences other users have done, that could be a painful chore. Also, it gives you 'Roid Rage' so just keep yourself in a 'Chill' estate as much as you can. In order to get the most out this compound, some advanced/experienced users have stacked their Tren A cycle along with Dianabol or other compounds, so just do a search on this or wait until some experienced members jump in.
Tren H, known as Parabolan, can be injected 1/wk or 2x/wk because of it's a long ester (stays longer in the body) and helps you get muscle mass, as long as your diet/wko routine is in check and consistent. LIke all Tren derivatives, it does not convert to estrogen. Also, when you're on a low calorie (but high in protein) diet it gives you that muscle-solid type of look as it helps you accelerate your metabolism.
Tren E, same as Tren H -in some ways, i.e., injectable 2x or 1 a week. It's a 19-nor (very similar to DecaDb) w/some but with the added benefit of not being able to covert to estrogen, while at the same time offering good AR binding affinity which simply means it is more potent or has -in 189 terms lol- anabolic/androgenic agent than deca. That translates to lean, quality muscle mass. Keep in mind that it will decreas your Cardio ability or just bring it down to a complete halt, this is also known as "cardio? or cough" or something like that... I'm lazy so don't feel like looking it up. Also, it's quite very expensive so prepare the pocket/piggy bank for this one mate.
Again, I'm not expert so for dosage usage... I don't know! Check this thread for your PCT though, as you'll need it.
189's pct opinion:
http://forums.steroid.com/showthread.php?t=354573
Also, go the PCT thread and do some reading! Don't expect "info feeding," I'm not being an ass!
Max