I could use some advice on good laying small breed chickens.
White Leghorns are usually considered the best layers.
Chickens come in two basic sizes: large fowl (sometimes abbreviated LF) and bantam (very small.) Some breeds come in both sizes (example: Bantam Brahma and Standard Brahma.)
Bantams are usually not good layers.
"Large Fowl" have quite a range of sizes. Leghorns weigh about 4-5 pounds when they are grown up, while some other breeds weigh more than twice as much.
So Leghorns are probably your best choice for a sort-of small chicken that is a very good layer.
Hamburgs come in several colors, are smaller than Leghorns, and are also good layers. Silver Spangled Hamburgs are probably the most common color of them.
If you want actual bantams, that typically weigh less than two pounds, you are going to have trouble finding any that are very good layers. Easter Egger bantams might be better than some of the other kinds of bantams, although that is "might be," not a certainty.
At 72 years old I don't move as fast as I use to. I plan on having four to six chickens tops.
You might want some calmer breeds of chickens. Breeds like Leghorns and Hamburgs tend to be quite active and flightly. Slightly larger chickens are often calmer. Rhode Island Reds and Red Sexlinks and Black Sexlinks are very good layers, a bit larger than Leghorns but not enormous, and tend to have much calmer temperaments.