How to frame a longer wall

attach the bottom plate to the slab
attach the top plate to whatever the old wall is attached to. Cut your studs to length and insert between the plates at 16” OC. Toenail to the plates top and bottom. Close up

Yeah, frame it in place. I would run 16 foot 2x4s if you can for the top/bottom, or a couple of 12 foot boards on each end and cut an 8 foot to length for the middle. I built a 12 foot long wall when we were doing a renovation about 10 years ago, but it had two doorways in it. One to a closet, the other to a bathroom. But I made the top and bottom with a 12 foot 2x4 and built it in place once those were attached to joists.

a level and a tape measure

Not gonna lie, maybe you shouldn’t try this yourself.

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Not gonna lie, maybe you shouldn’t try this yourself.

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What’s the worst that happens? I frick it up out of square and I’m out a few hundred in lumber?

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You’ll see. lol
Drilling into old concrete can be a pain when installing bottom plates. Be ready for that being a time eater. Have the proper drill bits and drill itself.

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Yep, not very fun. I used one of the TapCon kits that came with the fasteners and drill bit. A really good drill and an impact driver make a huge difference. I wasn't going into a concrete floor, but installing some wire shelving into a cinder block wall, and a half dozen screws took longer than expected. Framing a 30+ foot wall will wear you out.

if the wall is not under load or shear he can just glue the bottom plate down with construction adhesive