It's always a good idea to do some finger stretching and strengthening exercises before you start to play. I give my students a series of exercises to start with, and when I ask if they've been using them, the reply most of the time is a sheepish "I know I should do them more." So here's a sample of how you could get ready to practice by warming up.
- Spend at least the first 5 minutes doing finger exercises. You can do finger stretchers, play some chords, a few scales, or a combination of those things. To stretch out and warm up the fingers, put your 1st finger on the 1st fret of the 1st string. Without removing that finger, play the 3rd fret, 3rd finger, 4th fret, 4th finger, (yes, the pinky), then 2nd fret, 2nd finger. Do as many strings as you can do comfortably, remembering to always leave the 1st finger down. Use different combinations of fingers, 1, 2, 3, 4, 4, 3, 4, 2, etc.
- Play some chords. Work on changing chords, getting crisp, clear notes and strumming evenly. Put your fingers on the chord, then play the strings one at a time to make sure they're all sounding. Buzzing or vibrations are caused by not holding the string down tight enough, playing too far away from the fret, or letting the pressure off. Muffled or deadened strings are almost always the result of something being in the way. Another finger, a sleeve, or fingernails that are too long are the prime suspects. They will also be muffled if you actually have your finger on the fret.
- Slowly and deliberately play through some songs. Again, work on playing slow and getting the notes clear.
- Don't forget the right hand. If you play with your fingers, try some arpeggio patterns, if you use a pick, try playing scales while you use up and down picking.