ok i am going to BBQ today. To start off, going to BBQ New York steaks and BBQ'ed shrimp.

I am going to marinate my steaks and wondering how long should I cook them on each side to achieve a medium well? I heard you only flip the steak once on medium/low. Is this true? And for how long?

For the shrimp, thinking of making garlic buttered shrimp. Should I cook a set for about 2-3 minutes and during that time flipping them over?