I build a bike last year and got adicted. https://commutercycling.blogspot.com/...struction.html

But I need more tools, like a jig and I don't know what else?

where can I get frame tools? Nova does not have much...

A jig to grind the ends of tubes....?

look in the suppliers thread HERE
The only ones I didn't put in there is Anvil and Sputnik