What can I do to get rid of acne and then later get rid of the blemishes and scars?

See a dermatologist. There are many options for treating acne and you should see a dermatologist to discuss them in detail. Some of your options are cleansers, benzoyl peroxide, antibiotics, retinoid creams, chemical peels, isotretinoin, birth control pills to regulate hormones, led light treatment, and laser treatment.