I found online how to make a sampe batch of Biodiesel, it said all i need is methanol, lye, and oil. Ok here come the questions

What type of oil do I use?
Where can I get lye?

I know that that HEET stuff for gas lines has methanol, is that what I use?

Also do I need to do anything to my truck if I do run Biodiesel in it? They have some at a local BP and its almost the same price as diesel...I just want to try it and see. So is it just a fill up and go thing?

Can it be mixed with diesel? or does my system need to be cleaned out?