I’m fairly new to ruler work and am using a domestic janomie machine. All the rulers I’ve gotten are Westee brand. Which I like if you go to their site or YouTube there are lots of how to videos.
However, some other manufacturers have some interesting sets. But I would recommend the westee starter kit it comes with several rulers plus a small spacer ruler so you can keep your spacing accurate.
Someone mentioned a brand that has stops marked on the ruler those sound interesting depending on the design.
For newbies I’d also recommend look for rulers that have a lot of variety. Not just one design in 4 sizes.
Need coffee good luck everyone.