I have only build one rod ... but this is the advice I was given when I said I would just use a cheap blank. Don't! Build the rod you would like to own ... so I did and they were right ... it is my favorite rod ... T&T 9'-0" 5wt 4-piece ... I named it after my wife ... "My reason for living". :-)
I had help from guys in my fly fishing club and there are some good books out there too ... I would suggest you build your rod with a buddy, one that has some experance is best ... but just an extra set of hands can be good.