Chico, welcome to the community. The pain should go away as your fingertips get calluses. Have fun learning songs in each module.
Welcome Chico! Great to have you here! 
Get stuck in to Justin’s lessons and you’ll be playing some Pink Floyd before you know it! All the best with your journey! 
Hi Chico, welcome. Stick with Justin Guitar courses and you’ll be able to play at least a basic version of a couple of songs before you expect. Do your homework and have fun.