I did sust250 and dbol for my first cycle, had good results, gained about 15 lbs that I kept, had good strength gains as well. Make sure your diet is in check when taking sust250. You will have a lot of water rention and tend to bloat up while on it.
When it comes to sizes, some companies amp size is 2ml, but most of the time you will just see 1ml amps.