While taking Sustanon 250, it's important to keep in mind that it is a blend of four testosterone esters and the side effects can also be quite severe. Therefore, it is not the best choice for beginners. Most guys begin with Dianabol, which is comparatively mild in terms of side effects. You can, later on, cycle Sustanon.
In this time and age, there are safe alternatives available that can be a better option to these steroids since they do not have side effects and neither do they require a PCT.