I would highly recommend you avoid the doors at Lowes and Home Depot. We got them for our shower and they are not good at all. The glass etches very easily, they don't have the coating that was promised and the frame is cheaply made. You can do much better for the money elsewhere. Check the link below. I'm not affiliated with them but they are not far from where we live and I did look at their doors when shopping around. They seemed pretty good and in hindsight, I wish I would have gone that route instead. Here is a link that might be useful: American Made Shower Doors

For a roll-in shower you're going to want a 36" wide doorway at a minimum. That's a big slab of glass to be swung on one set of hinges. It could be broken up into two doors, like saloon doors. For hinging, you don't want the door to just swing in to the shower. A bather could become incapacitated, fall, and block entry to the shower if the door can only swing inwards. Same thing if this bathroom has a toilet closet. Use an outward swinging door for the same reason. Doors need to swing out, or swing both ways, in and out. Again, like saloon doors. Or a sliding door would suffice. For any sort of ADA shower, I always recommend NOT adding a built-in bench inside the shower. Use a moveable seat or stool. Much more flexibility. Consider having your shower controls just inside the entry so that the water can be turned on without the bather having to fully enter the shower, or be in the stream of water, when the shower is turned on. You'll want a handheld shower (plus other heads should you chose to go bigger). It'll help with washing down the walls in a large shower now, and it'll help with wheelchair bathing later. Just a few things to think over.

We put in the clear shower doors available at Lowes and love them. We squeegee each time and wipe the shower control and tracks with a towel. DH is actually so into it that if I take a shower and fail to do the job, he mentions it. I never thought I would be a squeegee person. I am always in a hurry, but I can do this in less than one minute. Less than one minute to help avoid hours of shower scrubbing. A no-brainer. In my hall bath, I wouldn't let the man put shower doors back in. The tracks got in the way of the Little Girl sitting on the edge of the tub to shave her legs, the shower/toilet area is tiny anyway, and there is little room to maneuver. So, I bought a couple of nice terry (white) shower curtains from HomeGoods. They always have nice and inexpensive shower curtains and other bath supplies. I keep it open so the room doesn't close in on you. Red

+1 to the guy with the weird cat avatar. Start with a glass supplier as this sounds right in line with what they do and there is nothing particularly difficult sounding about it.