DNA step parameters

[dnalectronics]

I am an experimentalist working on DNA-drug binding. However, to support my result I am trying to do simulation. Since I don't have an experimentally determined structure for my custom 12-mer DNA duplex, I have to create one from scratch. I am using  w3dna.rutgers.edu,  to create a wide variety of nucleic acid structures.  However, I want to know what is base parameter file or where can I get that file.

I will really appreciate if you can please guide me.

Thank you for your help.