There are tons of posts online about this... basically you can either go with a copy stand or something quite kludge-y. I made a light table and a wood brace that keeps my camera locked into position... I didn't use florescent lighting. Very simple for both 135 and 120, quick but not the best results as you are often spending an inordinate amount of time "cleaning" the images. Even white gloved and de-static work areas still require attention in post. In reality using a 3k$ camera for copy work is kind of ridiculous as you can get phenomenal scanners for a fraction of the cost. I only use my 5DSr for scanning work at this point... really don't use Canon for much these days beyond snapshots and scanning.
If I want super clean images, 600 dpi res... flatbed scanner (Epson 800 or Canon 9000i) and use automation software to remove dust. Batch scan and come back when all finished. I dev all my own film (C41, E6, BW) in a CPE2 as I prefer the control. If client work I usually send out negs for drum scans. Color is always by scanner, BW can go either way.
Leica MP with a Summicron 35 f/2
Ilford FP4+ EI 65
Ilfotec DD-X (1+4) 12:00 @20c
(5DSr with 100mm "scan")
This cannot be done with a DSLR as the negative is 2x3 in medium format... both this camera and my 6x12 create negative issues with a DSLR. Forget about 4x5 or LF, only scanners for this type of work.
Fuji GSW690III with 65mm f5.6
Kodax TMY-2 EI 300
Ilford FP4+ EI 65
Ilfotec DD-X (1+4) 8:00 @20c
(Epson V800)