Try to look for benches or like a rail

If you have some money, you can build a flat rail, which is cheaper to build, but harder to skate, or a ledge, which is more expensive but easier to skate

It'll be harder to grind though

Try learning on curbs

Build a wooden box (you can find many plans on the internet) and put angle iron on the side with liquid nails.

Make somthing outta wood and use a lot of wax

If you can find a well painted parking ledge that’s not too chippy with enough wax you can get them to work. A good way to test one is to just run your trucks against the curb with a lot of weight on your board with your hands, if you take your board off and see it’s chippy or becoming really rough don’t waste your wax on it. I actually was able to find a few spots around me that had a plastic shield on their parking curbs; with a little wax they slid as good as metal.