amazing, glad to hear that you want to learn pencil sketches
you can learn drawing pencil sketches with practice in 1 month,not detailed but you can learn to draw realistic, artistic and concept drawings,
I can teach you via video messages,images and with some tips,
I'm also not a professional artist so I can relate myself with a begginer artist and can give you some simple tasks to work that will help you to improve in 1month and then you can practice yourself for improving your proportions and shadings
you can checkout my works on Instagram
username : sushil_2303