Mac Newbie: Wireless NIC, new OS

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Joined: 12/07/2007

Hi -
I've been a PC guy for the last 20+ years and wanted to start messing with a Mac. I purchased a used eMac G4-700MHZ computer off of eBay last night. I'm looking for a wireless USB NIC for it, and all of those I see on eBay require OS 10.3 or 10.4. The eMac comes with 10.1.5 preloaded, with no CD's. What are my options? Are there wireless NIC's that work with 10.1.5? Or do I (and can I) upgrade to a newer OS? Thanks in advance, Lee