Welcome aboard. Please check with S&W to see if your 9 EZ is part of a recall due to issues with hammers.
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As for lights, the Olight combination that I gave to my friend when he and his wife purchased their 9EZ is much liked by them, USB recharged so you don't have to buy expensive proprietary (oddball size) batteries, and adjusts more than most others to give a very comfortable reach to the switches.
Baldr Mini Micro Tactical Light 600 Lumen | OlightStore
With Olight I have found that if I get on their mailing list, wait a wee bit, and watch my email I get a serious discount on whatever I am planning on buying from them.