Design your frame and then select your lugs and other materials. The less experienced you are the better it is to have lugs that match the frame angles. Hank mo longer has his Henry James lugs made. He had 4 down tube angles, 57,59,60 and 62. These were fantastic for beginners. Some can still be found. He had a couple of degree options on his top and seat lugs too.

Stamped and welded or Nikko bulge formed lugs can have they angles modified more easily. I have some sets of Nikko lugs. You can get a better fit with seat and top tube lugs by sloping the top tube a degree or 2.

A punch set is necessary if you want to get clean shorelines when you braze. That way you can place your blows more precisely.