Not sure I fully understand your first question. You'd use the Taurus sights just like the sights on any other pistol. If you don't know how to aim a pistol, you should get yourself to an NRA Basic Pistol class before you do anything else (www.nra.org).
Straight 8s are the sights designed by pistolsmith Dick Heinie. Here's a pic: http://www.heinie.com/images/eight.gif.