tig, braze, epoxy blah blah

it is simple
You need to go here http://www.bikeschool.com/
to get some faint idea and a start
and then if inspired
seek a job in the industry
relocate, slave, sweep floors, take each step over the years
rather than hope to be inspired by "Pro frame builder's ideas"
listen to full time/life time builders
read about their path ways
because a passion {hobby} for designing bicycles is not enough to understand the toil and perseverence required to make a living making bikes
and also the consequences of this
I may sound harsh but it is the reality of your dream
nothing wrong with the dream
but it is not internet shopping