As a steroid, it has the potential to have the same side effects as any other steroid. Anavar is a milder steroid, but it is STILL a steroid. Potential sides include, but are not limited to: fucked up lipid profile, enlarged clitoris, acne all over the body but specifically on the face and back, oily skin, virilization of the face, emotional sides (depression, aggression, etc), bloating .... just to name a few.
Anavar will not give you results without a SUPERB diet and training plan. And a superb training plan is heavier on weights than cardio.
If you are doing cardio 6-7 times a week for 60min+ then you need to address training issues FIRST (especially if this is all steady state cardio).
If you are not already eating clean, or have not been eating clean for at least 6 months, then you need to address diet issues FIRST.