GameRager: Wait until you get out of the building and into the town areas.......and you get to start picking and choosing missions and classes and such.
I like the various items you find along the way and things you can do with them as you play as well.
kavazovangel: Assuming I spent the whole first three hours just exploring everything in just the starting floor... will I be in for a long run? Few hundred hours of gaming, perhaps?
Probably.
Keep everything you find in the starting floor for use later(weapons/healing stuff/etc)....i.e. pick up stuff and talk to NPCs to see if they can use it or you can use it on them somehow.
Also examine everything after picking up other things(some stuff you find in some areas can be used in encounters with other NPCs later.....scalpel at start, for instance, can be used if you talk to some of the patrolling zombies in the beginning part.)
Also if an NPC like patrolling zombie seems to have nothing special about it and you've exhausted all posible dialog/inventory interactions feel free to kill em for experience and coin.
And be sure to explore whole building and do everything before going out.....it's best to do it that way imo. Once you go out you may forget to go back if you wish to....the outisde is THAT big and impressive.