If you are talking about an ABS system, like being able to fight enemies in real time on the map without going into a turn-based battle, this is probably one of the most complicated things to pull of on any of the RM systems. You'd primarily have to be very good (if not excellent) at events, switches, variables, pictures...
Anyways, I don't believe there's a tutorial available, however this was discussed recently, so maybe you can find some insight within this topic:
http://www.rpgrevolution.com/forums/index....c=53232&hl=Edit: As for why it takes you to the "strange" battle scene is because by default the system is a turn-based battle. As for replacing resources (ie., sprites, you'd need to add in new sprites). There's plenty of tutorials available, but since I don't use 2K or 2K3 myself I don't know how much different it would be from XP or VX in terms of size, colors, and resources.