I would rather use something much safer to kick start the cycle, such as turinabol - it will add a lot of strength and mass in no time, and it will cause minimal side effects. As for the AI choice, for a long run it would be much healthier to use aromasin instead of arimidex for the following reasons:
1. Aromasin is a suicide inhibitor, so there will be no estrogen rebound once you stop taking it. Meanwhile, this estrogen rebound is well possible with arimidex, since it is not a suicide AI.
2. Arimidex will stress your lipids by increasing the levels of LDL cholesterol (the bad one), whilst aromasin will increase the levels of HDL (the good cholesterol).
3. Aromasin will increase your IGF-1 production by up to 25%, which is very good for muscle growth and recovery, which is not the case with arimidex.