Does anyone have any suggestions as to where to start?

1. What do I need in terms of hardware? Something to braze, and something to braze with, I assume.

2. Lugs. Seatstays. Bottom brackets. Dropouts.

3. Tubing.

Any cheap sources for 2 or 3? I really don't need nice stuff. At all. Just stuff to practice with.

I want to start building simple lugged steel frames for fun, among other reasons.