[D&D] Monster creation?

[zakarntson]

I'm going to start running some D&D pretty soon here, so I'm working on creating some new monsters. And holy cow, is this a non-trivial practice. I figure I'll get better with time, but just trying to make a "ratling" is a chore. I'd love to be able to input a set of parameters and have it spit out a monster. I'm working on modifying the kobold entry with pertinent details from rat, but I'm still having trouble.

• "Where would I put Disease Resistance? Disease isn't an energy type, so I'm guessing it's a Special Quality"
• "The Kobold entry at d20srd.org says Kobold, 1st-Level Warrior, which I'm assuming means a single level of Warrior has been added to some platonic Kobold, but I don't know how to get back to that ur-Kobold."

What I really want is a myriad number of templates that I combine to make new monsters. Really boring templates applied to some kind of blank slate:

Ratling (Humanoid base)

• Small
• Animal (Rat)
• Combat Style (Cramped Conditions)
• Adaptation (City)
• Adaptation (Sewer)

Scary ratling pet (Animal base)

• Large
• Animal (Rat)
• Adaptation (Sewer)
• Disease Carrier

Fountain Ooze (Aberration base)

• Huge
• Immobile
• Touch Attack (Minor, Acid)