Just buy a popular router and you will have no problem.
Search for a brand name with a good reputation. Mine is old WRT-54G and it still supports numerous cell phones (WiFi), printers, notebooks, laptops, CCTV cameras, etc.
I use MAC Addressing together with WAP security settings. It's all in the router documentation.
You will be in good shape. Remember, range of the wireless may vary depending on your specific house/locations.
"Peace is that brief, glorious moment in history when everybody stands around reloading". Anonymous
Earp: Not everyone who knows you hates you.
DOC: I know it ain't always easy bein' my friend....but I'll BE THERE when you need me.