Dunno what tool 2 use, plz help!

i need a tool that will convert .blp's into .mdl's. can any1 tell me or link me or something?

Dude, you mixed up something.
BLP is a 2D image format, while MDL is an ASCII 3D model format. Therefore you can't convert between the two. Maybe you wanted to know how to convert MDX to MDL? If so, get War3FileConverter.

no, i have heard of yobguls convertor or something like that. and it does work.

Yobguls converter is the War3FileConverter.
It can convert MDX (binary model format) to MDL (ASCII model format, which can be edited easily). It can also convert TGA to BLP, but I suggest to use War3Viewer for that.
There is an Important Threads thread btw, which is stickied.