Plans are a great help in losing weight so it is good to see you've taken the initiative.
Goals tend to be set according to what the motivations are for individuals. I tend to be encouraged by short-term successes so have preferred short-term goals with small rewards, such as "I won't eat any bread today" and will celebrate tonight with a glass or two of good wine if I reach that goal."
There is an article in, IIRC the Diet section, about goals and motivation on the main website attached to this forum.
People using Duromine (there are a couple of Duromine-related threads in the forum) have often mentioned that they experience weight-loss of more than one or two Kg per week for the first few weeks before it tails off to a sustainable level. However, it's not used as thermogenic diet drug, but is just an amphetamine-like substance that, as you said, helps kickstart a person's motivation and energy levels. It is still the standard body processes that are actually driving the weight-loss.
On average over a long period, 0.5 to 1 Kg per week is the published medically acceptable rate of weight-loss. At the end of the day, it's just a matter of being in it for the long haul and making more good than bad decisions about exercise and food.
There are things you can do here in the forum to help you along - such as keep a public progress diary and join in the challenges. It's all to do with motivation and focus.
Striving to improve in every way possible.