You can find an article about creating the methods on the Microsoft Developement Network call "How to Create 32-bit Import Libraries Without .OBJs or Source"
However that is only part of the problem.
Consider if you find that the dll has a function like this:
InitApplication(char*, int, char, long);
What do you put in for each of those parameters? The only way I know to do that it to use a debugger and step through the assembler code figuring it out as you go. Alternatively you buy or find a disassembler - C code would probably be easier to figure out.
I would also seriously suggest finding some different lists/news groups than this one. The topic has nothing to do with java. So you are likely to get better help somewhere that is more specific - like one of the MS lists.
A disassembler takes a binary and produces 'code' from it. The type of code depends on the disassembler, it could give you machine op codes, C, C++, etc. C and assembler are the most likely possibilities.
Once you have the code you will need to find the methods and figure out what they do.