different questions about RTW, S-function and tlc file

Good afternoon, I am using matlab 2014b 64 bits in windows 7 64 bits. I have different question about real time workshop, s-Function and tlc file.

I have a simulink model with different S-Function blocks. To access to the model i use a GUI. With Matlab and Simulink everything work perfectly but the next step is to try getting a .exe file.

For the simulink model I want to generate a dll file, after that with the Gui I will generate an .exe file with the dll and the visual part. My questions are:

1- to generate the simulink dll it is obligatory to create an tlc file?

2- if it isn`t neccessary, how I should do? I try with non-lining option activate but when I use load library function it returns;

3- it it is neccesary to create a tlc file, is it posible to create it from my Sfunction file directly? how?

4- where can I study about how to create the tlc file?

5- if I have a cpp file with different functions like (mdlinitialisized, mdlOutputs, ...) is a good idea to use encode_legacy function?

in the future i think I will have more questions but these are ones I have.

Thank you for all