I actually shuffle the "tournament shuffle", as we call it, and it works like this:
You take the top card of the Deck and put it on the table face-down. This is stack 1, then. After that, you take the second card and put it beside stack 1, also face-down.
Repeat this until you have 6 stacks. Then keep on putting cards on those stacks until your whole Deck is empty, when you had, as example, 60 cards (like in MtG!) you have 6 stacks à 10 cards then. I found out this is really the best way to shuffle.
As sleeves, I use Ultra Pro. Some of my Sleeves are about 8 years old but look still great!