Also Lord Marcus who is a Mantic Games Pathfinder, has posted some helpful tips below......
Lord Marcus wrote:
1. Remember characters are not one man death machines for units. they are powerful support units in and of themselves. i found this out using a vampire lord for the first time with my undead.
2. Remember the stat lines represent units, not individual models. Nerve is not wounds, although it may seem like it. I guess it's easier if you've had a taste of some historical rules like i did, but nerve represents the units will to fight on, not how many individual guys are left. hence no removing models (This is also easy to get over, despite the misconception that it is not. it takes a few games to get used to removing units instead of models individually.
3. Furthermore, the turn and combat system will be odd for the first game or so, due to each turn being self contained. specifically i reference the melee combat section, as the opposing player does nothing, which will seem odd for those used to taking armor saves. The way I explain this in my demo's is that by dealing wounds, and thus getting through your toughness value, my warriors blades are going through the armor, finding weak spots, etc, hence no need for an additional saving roll. The ebb and flow of the battle lines is mirrored by the 1" pushback after combat.
4. Maneuver and movement are key. Again, characters are not mega cannons to bull rush in and tear faces off. set up flank and rear charges, and think tactically.
5. finally, do not try timed games the first few times around. get used to the basics of movement, fighting, and unit management before you try a timed game. BUT DO TRY THEM! They add an element of pressure to the game and force you to make tactical decisions on the fly.
You can also have a look at the following thread by Lord Marcus which may answer any other questions you have - LINK