You mean a graphic tablet? You can find useful ones on the internet starting from maybe 30$. I've always used a Wacom one though which still works perfectly a decade after I bought it.
For drawing on paper, try using the pencil with only very little pressure. I do many scribbly small lines that end up with the sketches being really, really messy, but showing a full picture.
It's always good to practice with the things you love. All my sketchbooks are full with Stan sketches.