Follow your coaches advice as far as technique goes..He knows you and your skill level better than any of us do so follow him hes who got you there. Now as far as conditioning advice I would suggest looking on Youtube.com for a workout called the "Magic 50"
Im the Strength and Conditioning Coach for a MMA team in Charlotte NC and we do a shit ton of grappling tournis (Were actually doing the bud cup next sat.) I ALWAYS boost our guys stamina and endurence with magic 50 3-5 times per week pre fight, it keeps everything loose and it helps alot with grip strength and overall cardio and endurance.
Obviously technique and skill play a massive role in Combat Sports, however if you are too weak to do the technique and your too tired nothing matters.
Here is a link to the school that I teach and fight out of, Bobby the guy on the front page just fought in Boston in Fullforce MMA and won in less the 45seconds, one of his daily workout exercises was "Magic 50" from http://www.rosstraining.com/
Hope this helps and best of luck! Adam.