As far as the amps, I've never used those, so I don't know what it is supposed to look like, but if it is real, Organon is typically a great line of products.
You are correct, 250mg/wk is not a good cycle, 500mg/wk is far more efficient...at 250mg/wk all you did was basically shut down your natural test and then replace it. Yes, 250mg/wk may very well have been more test in your body then normal, but at your age not all that much.
For most people, it can take any where from 4-6wks of steady therapy to start noticing a big impact. You've just started dosing the sust at a decent level, so give it a bit more time. You should eventually experience a increase in size and strength, but how much is hard to say...it's differant for everyone. A word of advise, do not neglect your diet. You need to make sure you're getting enough calories per day or the cycle will be worthless...that goes for any cycle. I would suggest mapping out your daily eating habits to see how much you're actually getting, if you haven't done so already.
Last 2 things, if I were you I'd continue this cycle a bit longer, make it at least 12-16wks long in total length. After that, make certain you do a proper PCT and take some time off. And next time, when you're ready, after you've researched a bit more by means of reading this board, reading drug profiles, asking questions, searching this board and others, then you should be ready to run another cycle, but this time hopefully, you'll be able to do it right from the get go.