Hi Kerry..!
Welcome as well!!!! And welcome back to collecting. Don't be discouraged by your first purchase - just learn from it. Next time - you'll be a better informed buyer, know a bit better the questions to ask and what you should expect. And if ANYONE says they never made a mistake in Collecting Lugers - either they are not confessing the truth, or just been damned lucky
I agree with Ed.. Read, read, read. Then read some more. I would suggest Jan Still's books first - all the volumes. They are complete and excellently compiled/presented.
I would also suggest, as Ed hints at - pick a variation which intrigues you the most - and start collecting that variation. When I first started out over 30 years ago - frankly, I was "all over the map", and I sold most of them to start a basic collection in one variation, which has grown over the years...
The last suggestion I would have is ask questions here - before you buy your next Luger. The folks here and on Jan's site are all willing to assist a new collector. And their combined experience exceeds any resource that might be found elsewhere...
Again - welcome! And keep us posted!
John D.