Hello Sir,
1st thing you would notice in your right knee is the instability(due to Ligament Injury).
Apply Ice packs, it will help u alot.
Next Steps
You have to immoblise your knee, i.e, no Knee Bending so that stretched ligament inflammation gets setteled.
Seek a Physiotherapist near you, who can assess your knee to get to the right diagnosis, whether its Ligament or Miniscal Injury.
Health Tips
Apply Ice pack
Wear Knee Immobliser
Kinesio Taping( done by Physiotherapist )
After 2 days (when pain is reduced), go for knee strengthning exercises, Knee Isometric's, Resisted Band Exercises (Taught by your Physiotherapist)