Try using this 5 step method. Remember it's best to focus on the chords or areas you are having trouble with after tuning and warming up. Sit comfortably with your back supported and feet touching the ground - relax and have fun!!
Guitar Tuna is a free online tuning app.
2. Warm up
One finger, one fret starting on string 1 to string 6.
3. Difficult first
Start with most difficult song or exercise.
4. Then Easy
Then play something easy.
5. Be creative
Make up some chords or try writing your own songs.