Rabbi Kook, the former Chief Rabbi of pre-State Israel, used to lecture on the subject of the mitzvos all night. Every year he would begin where he had left off the previous year, going through Maimonides (Rambam) Sefer Hamitzvos. He would elucidate each one, drawing his vast knowledge.
Here are lists of miztvos we can do TODAY. Dowload and read – it’s not in depth, but you can cover them all in a short time.