Okay, this is tricky because Lani Lynn Vale has a pretty massive backlist, and jumping in can feel overwhelming. If you're totally new, I'd actually say avoid the very first series, 'The Dixie Wardens Rejects,' unless you're prepared for her rougher early style. The characters are great, but the writing isn't as polished as her later stuff.
My real recommendation is to start with the 'Code 11-KPD SWAT' series, specifically book one, 'Center Mass'. It's where her signature formula—alpha male first responders, strong but vulnerable heroines, fast-paced romance, and that small-town Texas vibe—really clicked into place. The characters feel more fully realized, and the interconnected world starts to build nicely from there. You'll get cameos from other series, but it works as a solid standalone entry point.
After that, if you love the over-the-top protective alphas and the interconnected families, dive into the 'The Uncertain Saints' series, which overlaps a bit. But honestly, starting with 'Center Mass' gives you the purest taste of whether her brand of insta-love with a side of danger is your thing.