Welcome to the club! The SR9 is the first pistol I ever bought, and my most frequent carry and competition gun.
The first thing I would do is find out which generation of the SR9 you have. if it has a round magazine release you have an earlier one, and if its a D shaped mag release, its one of the newer ones. The newer ones have a better trigger (or so I've been told) but if you have an older one, don't worry. Mine is one of the first or second generations (in other words, it has what some people refer to as the "duck hunt" trigger) and despite the supposedly crappy trigger, I still shoot it pretty well. If you find you don't like the trigger, you can always get a ghost trigger bar drop in part that I've heard some pretty good things about.
The other thing I would do is remove the magazine disconnect safety, if you feel comfortable not having one. Personally, I see no point in it, and removal is pretty simple. There's a couple videos on YouTube showing you how to do it. It only takes about 5 minutes. After you remove the mag disconnect, you can dry fire the gun without damaging the firing pin.
I think they are pretty reliable guns. I recently hit the 3,000 round mark, and all of my malfunctions have been hand-loads that didn't have enough powder to cycle the action all the way (Shouldn't be a surprise, since I was just starting out with hand-loading and all of the loads were below the recommended starting load.) I've had one other malfunction, which I attribute to jerking the gun back while firing (I was shooting at point blank range in low/no light, and it surprised me.) I guess what I'm saying is all the malfunctions that gun has had have been because I was stupid, not the gun being stupid.
Really, the only cons to the gun that I can see are that magazines are expensive, and there seem to be a lot of folks who don't take that gun seriously. Also, I think the pin that holds the back-strap in place is a little on the delicate side. Mine broke in two (hey, it was my first pistol). I'd recommend deciding on which back-strap you want to use, and then just not playing with it.
Like I said, I took out the mag-disconnect-safety, and I blacked out the dots on the rear sight, but otherwise, its bone stock.
Overall, I'd say its a reliable, accurate pistol, and I like mine very much.
Oh, one more thing. Get out to the range and shoot it. The gun wants to be shot.
Chris "the Kayak-Man" Johnson