New here

Hi just signed up, been out of the emulation/ng scene for a year or so and have been catching up, finnaly got to play mslug3 and now trying to get 5 to work, i figured out from posts here already how to get nebula etc to run them, only prob i have now is where do i get a dat for it? Or is there already a *fixed* nebula version that supports most of the newer games?.
Thanks in advance.