Deca or HGH won't heal a ripped ACL. Whether it's partially torn or fully separated, steroids/hgh simply will not magically reconnect tissues or grow them back to initial strength. There's obvious supporting research on use for muscular degeneration diseases, and joint repair of existing damage, but never expect to go from a moderately/fully destroyed joint to a brand new or minimal one. Just doesn't work like that.
So ACL tears come from a typical plant and twist style motion, where usually the femur (thigh bone) doesn't move and the tibia translates forward (anterior) and in a twisting motion it rips it from the bony insertion on what's called the tibial plateau. When this happens, imagine your knee will shift forward like a wooden drawer. It becomes unstable, and as it slides forward you lose ability to contract your quads and hamstrings and you fall...worse case usually breaking a bone. Typically, meniscus injuries happen as well as medial collateral ligament injuries in conjuction to a tear given the way the mechanism happens.
Until you see a surgeon for a consult, simple low load quad exercises like leg press, split squats, leg extensions, curls, stiff legged and romanian deads are your best bet. Things where you can control the weight without lock outs and being able to control the time under tension. Balance board exercises from side to side, pool running, bosu ball balance, lateral band side step work, cutting exercises on a ladder all need to be done to increase the motor control and dynamic stability of your knee, as if the ligamentous control is no longer there you need to use your muscle control to stabilize.
Ice if it's throbbing and hot, otherwise heat/hot tub/bath for blood flow. Use NSAID's only as necessary. The gear will help of course with muscle growth and prevent atrophy with a damaged knee but it won't do crap to build dynamic (movement) stability to keep the bone in place as you move.