Always start this endeavor by finding a reliable supply of WVO. Dont even think of building or paying for a plant until you know you can get at least 200 litres a month. So start knocking on the doors of all the restaurants, fast food outlets and fish shops you see.
Be prepared for the fact that chemicals such as Methanol and KoH can only be bought in bulk, ie minimum order of 200 litres (44 gallon drum) of meth, 20 kg bag of KoH. This is enough to react one tonne of biodiesel.
Good luck, AND OH yeah read all you can on this forum on OH&S.