There are many things that you need to consider when trying to rehabilitate, here are a few things to think about (not meant to be definitive and just a guide that may help.

*what are your aims (what do you want to be able to do)
*short term / long term goal setting (useful to stay focused / motivated)
*what is your base line (what are you currently able to do)

You need to make sure that before you start doing too much that you have full range of motion at the knee. Also watch out for swelling, heat, restriction in movement, pain etc..post exercise, these are good indicators that you are doing too much (muscle ache relating to increasing activity is fine, just give yourself adequate rest between sessions)

Injury can leave muscles around the injured area, as well as those further away from the sight weakened. This is often compensated for by stronger muscles, which can leave the joint suceptible to further injury. Thus seeing a physio (sports rehab specialist) for functional assess / muscle testing and exercise program advise is a good idea. It is important to ensure strength of isolated muscles that may be weak, such as glut. max., glut. med., quads, calf, are strengthened before functional exercises are undertaken (thus leg press, leg ext, calf raise / press, glut. max prone, glut. med. side lying etc......before squats, lunges, step downs and running etc).

Clark, NC suggests using 2 tools for assessing strength..
*Limb Symmetry Index (%) =Injured Limb / Non-injured Limb x 100
(Barber et al, 1990; Daniel et al 1982...Normal 85-90%, Clark suggests >/= 90%)

Leg Press (single)
*Relative Strength Index (%)=Weight Lifted (Kg) / Body Weight x 100
Aiming > / = 125%

Ensure good technique when testing and maintaining alignment of joints. Speak to good sports physio / sports rehab. specialist / good gym/personnel trainer (who understands nature of injury and training progression in relation to this) for a good strength training program (not just weights work...don't forget glut. med etc)

As strength does not necessarily correlate to functional ability it is important to progress to functional activities when appropriate (Clark, 2001; Fitzgerald et al., 2001)

Progress functionally from non-impact, to low impact to high impact as able, ensuring good form and no adverse reaction before moving on...be advised by therapist.

God info in following articles...Clark (2001) Phys Ther Sp, 2, 91-105; Clark (2004) Sport Ex Med, 18, 16-21.

Some functional tests that may be useful to monitor progress, as appropriate...
*Single Leg Press Test
Predicting One-rep Max
Periodization Training

*Adapted Crossover Hop for Distance
Clark et al, 2001

*Step Down Test
Loudon et al, 2002

*Star Excursion Balance Test
Hertel et al, (2000); Lauren et al (2000)

*Figure 8 Shuttle Run
Keskula (1996); Anderson et al (1991); Tregner et al (1986); Risberg & Erkland (1994)

Couple of good courses therapists may be interested in...
*Functional Performance Testing Following Knee Ligament Injury
*Proprioceptive & Neuromuscular Control in Rehabilitation of the Lower Limb

Hope this was not too waffly and of some use....there is loads of stuff out there, best to see a good therapist for program with goals etc...should not need to see too often if initial time is spent assessing / forming your program.

Good Luck.