Firstly welcome to the Forum! Its always great to have more people having a go at this awesome sport.

I think the first port of call is what is your skill level and knowledge base. We could easily tell you what parts to get and where but it is of little use if you don't know how to put it all together.

I am guessing you intend to build a Featherweight machine, 13.6kg max weight, do you have a design in mind or a weapon or are you literally starting from scratch?