Welcome to GT... :)
When I write up practice routines for people, probably about 25% of the time goes to theory. It holds everything together and actually makes things easier once you have a little theory under your belt.
What should you be playing? After the practice element of scales/chords/ arpeggios and technique exercises to build picking speed and dexterity, legato etc... if you mean pieces, play what you want to play. It''s the best way to learn, and becomes its own reward.
On the beginner lessons - if you're having trouble now, It's probably down to gaps in knowledge so the only way to fill them will be to revisit the material. Obviously if you know which string is which you don't need to spend much time there, but just glance over it to check you really do know... AND... that you're right in what you're thinking...
On lead playing, if you don't know the 5 shapes for pentatonics that that should be your first assignment. It's all about practice - there are jam tracks here and all over the 'net. you can 'borrow' licks and runs off people, but only in playing more and more will you start to make them sound like yours... start with the basics, and build slowly.
Sadly, there are no secrets.... it's all practice and committing time to it. Daily practice is better than a weekly monster session.
Check out my music, video, lessons & backing tracks here![br]https://www.renhimself.com