Annie, sure. Here's a link to OSHA's
Sewing Ergonomics pages. This is sewing station design, please look at all the other pages too and especially stitching. Here's an infographic from the page.
Hmmm. You shouldn't need to bend over when you're sewing. Is that an issue with adequate lighting or needing vision correction?
Sometimes we think we need our nose in there but if you look at the image a lot of us slouch/crouch in front of the machine.
It starts at the bottom. Feet should be level, chair height so your thighs are basically level. Chair should have lumbar support-adjusted to you- and your back should contact the back of the chair. Ideally the machine is flat bed in the table top so your wrists aren't tweaked. Your forearms should be level while sewing. If using a portable machine using an extension table helps to give you a larger level surface.
You have to adjust the table top, seat and floor for all of that. Table higher or lower, seat higher or lower, maybe a cushion under you and possibly a platform for your feet and the foot pedal.
I'm 5' 8', very long torso so sit high in the seat. My table is too high so I need a cushion and a platform for my feet, as my legs are sorta short. It does feel like I'm far away from the action of the needle but with proper lighting and decent glasses I can get used to it. Partially it's retraining ourselves to adopt better posture.
My PT also said not to sit there for more than 20 minutes without getting up and walking across the room. Just takes a minute but it interrupts bad posture.
OSHA is US Dept. of Labor's Occupational Safety & Health Administration. I get great factoids from them.