Just take it easy until you have someone assess the knee and give you further advice, stay away from aggravating activities and open chain loaded movements (leg extensions in the air etc. look up open vs closed chain on google) as you will want to prevent too much anterior translation of your tibia.

If you have completely ruptured the ACL, you should be worried about if further degeneration / injury to the other structures in the knee while it is acutely instable. If you are careful (no running / uneven surfaces) you should be able to mobilise without aids (if you can't though don't force it!). Try not to stand from low seats etc. without being very careful or using the arm rests heavily as well. What are your pain levels and is there large amounts of swelling? or no swelling in the knee? When did it swell? instantly or 24 hours post injury?

No sport goes without saying, no running etc. for a while sorry.

When you rupture your ACL you put increased load on the other intrinsic and extrinsic (inside and outside) structures in the knee, increasing the risk of further injury! Keep that in mind before you start limping around though