Library Files ( NEED HELP!!)

Hello,
I'm trying to create my own library file and include it into my project

1)I've written two function in separate files abc.A51 and xyz.A51
2)These files contain only 1 functions each
abc() and xyz() respectively
2)Then I created a project called "MyLib"
3)Then I included both abc.A51 and xyz.A51 in the project
4)Then I compiled it to a "library"
5)So I obtained the library file MyLib.lib and also abc.obj, xyz.obj
6)Now I create another project "MyProj" and a main.c file

My question is how do I include the library file MyLib.lib into this main.c file in the new project?
Note that originally my function was in assembly... so i didnt have header file for function prototype.
Also, If my main.c file uses only one of the functions ( example abc() ) will my final object file take less space compared to if i used both the functions ( abc() and xyz() )

Thank You

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