can anyone tell me where i can find rims for my 1989 ford escort lx

Junk yards have plenty of rims. You need 4x108.

could i change my wheel size from 14 inch to 17 inch rims

yes

Be carefull with that because that will throw off your speedometer, handling, ride quality, and I'm probobly forgetting some other things. Just thought I'd let you know if you didn't already.