I want develop the muscles in the area around my patellar ligament. I am injured in this area. What program would be best, or what should I look for in a program, for me to strengthen this area in order to prevent more injury?

I want develop the muscles in the area around my patellar ligament. I am injured in this area. What program would be best, or what should I look for in a program, for me to strengthen this area in order to prevent more injury?

What you need is a rehab program to get you back to good shape, followed by a proper program to prevent the condition from happening again. I have to qualify my answer by the fact I am not a physical therapist, and I highly recommend you see one.
In general, rehab programs involve ridiculously light weight with ridiculously high repetitions. You will be living with very light weights or resistance bands for a while. You will also need to work on the supporting muscles which the connecting tissue connects to. This article on T Nation has a good bit of information:
Once you've rehabbed the knee, you can resume a nice balanced program that incorporates both anterior and posterior work for your legs like squats. Just make sure that your form isn't going to reintroduce the problem. Post rehab you'll want to make sure of the following things:
Mike Reinold is the sports Physical Therapist for this - check out "Solving the Patellofemoral Mystery" for a starting point. It leads you to seven heavy duty articles aimed at PTs in clinical practice. It might encourage you to seek out professional guidance as an informed client who can actively participate in his own recovery. Don't forget that in addition to things you should do, you need to know what NOT to do. To be honest, I've always diagnosed myself and ignored those disclaimers about "seeing a doctor before embarking on any exercise program" and have only been wrong once in 45 years. That resulted in rotator cuff surgery, but that was a complete success. I'm telling you this to show that bad things can happen if you self-diagnose, they usually don't, but they only have to happen once. Reinold says that a coach or PT can only "rule things in" - it takes a specialist with test and scan results to rule things out. I wish you all the best in whatever decision you make.