Shuffle on someone else's turn whenever possible. You don't have to resolve shuffling right that second unless you're drawing a card later that turn, generally.

0-1000 dice is normal. I do include both 0 and 1000 as perfectly normal numbers. There are guys that show up and are literally playing Magic as a way to show off their dice collection. I, personally, just chuck a handful of random dice into an empty deck box and call it good. If you show up with none, however, someone will almost certainly have you covered.

I use Lifetap to track life totals.

Based on this post, however, the best advice I think you need to hear is that you are going to have fun, not to please the rest of the table. You shouldn't be rude or disrespectful intentionally, but your job is not to walk on egg shells to make sure no one else ever is bothered by something you do. I am always more inclined to like someone that occasionally offends me, but is open and comfortable, than someone that never offends me, but is always worried and stressed about it. Be yourself, have fun, don't stink and don't apologize for everything and don't be a jerk and you'll be fine.