SUPER SIMPLE DUMB Question about hard-wired desktop mac and wifi for iPhone

Sorry if this has been already answered a million times. I have a desktop mac with a cable modem ethernet internet connection. I want to leave this hard-wired and setup a wifi network for a laptop or iPhone. What's the cheapest easiest way to do this?? I've never done anything wireless before.

Could I just somehow split the feed from the the cable modem or ethernet cable and route part of it into an AirPort express??
Unfortunately, no. This would create "confusion" for the modem as it is only expecting a single device to be connected to it. To be able to support both wired & wireless clients, you would need an Internet router with a built-in Ethernet switch, like the AirPort Extreme Base Station. If cost is an issue, you do NOT have to use an Apple router. There are a number of other vendors, like Belkin, D-Link, Linksys, & Netgear, to name a few, that offer similar models.

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