Thank you. You could start today by doing 10–15 minutes of watching the breath per day, which I demonstrate here: https://youtu.be/M8OIO0SlnaY
I also recommend signing-up for a free 10-day Vipassana retreat near you. It’s often necessary to sign-up several months in advance, because the demand is so high. So I recommend doing this ASAP, as in today: http://dhamma.org
Regarding best time to meditate: first thing in the morning. Get up a little earlier than normal, if necessary.