1. https://www.youtube.com/watch?v=4iIGhqi57es
u can refer this brushing technique its pretty " textbook "
as for receded gums especially for front teeth , u can do  regular scaling and polishing combination of good oral hygiene habits to prevent the condition to be worsen .
as to grow it back , with my limited knowledge , the only possible way is to do periodontal surgery to fix it  ( again , its different case to case depending on the cause and the condition of bone , gums and teeth ) 

2. i use TePe toothbrush ( soft ) , toothpaste i dont really care i just use whatever i have but most of the time colgate