There are many procedures like the microneedle RF or even lasers or subcision technique that can help reduce the scarring. For the dark spots chemical peels help. But what you need to know is 1. Your active acne needs to be under control 2. The improvement in the scarring depends on the grading of your scars. There are different types of scars: rolled out (respond best), box and ice pick scars (respond anywhere from okay to good). So a clearance of 100% isnt seen(usually the response is anywhere between 40to 75%). A cocktail of the above mentioned procedures (as customised by your dermatologist) helps us achieve the best results depending on the status of your scars. 3. The dark marks (post inflammatory hyperpigmentation ) are most likely to completely go away over a period of time. 4. And for both the scars and the marks, multiple sessions of procedures are needed. Only 1 session usually doesn't help.
My sincere suggestion is that you visit an allopathic dermatologist to get your skin analysed so that you get an idea on 1. the type of scarring you have 2. how much of an improvement is expected 3. how much will the entire thing cost you and 4. over how much period of time will it be spaced.
Avoid self medication with those anti scar and anti mark creams that you see on tv and the web. They might lead to active acne.