If you are new to slr photography, one way to do this is to get a do-it-all third party lens like an 18-200. Then shoot with it and see what focal lengths you shoot the most and then spend serious money on the lengths you prefer.
From the brief info you have given it looks like you want one zoom lens for indoor and a longer lens for outdoor.
I have the pentax 50-135, its long enough for me and takes great pictures.
The 16-50 takes nice pictures: but its a big fat lens for indoor use and some people tend to freeze if you point it at them. [I rented that lens from
CameraLensRentals.com - Canon, Nikon and Pentax Lens Rentals. which by the way is another way to 'test' lenses especially the more expensive ones]. I am still looking for a fast indoor zoom that is also fairly small. I may still get the 16-50 but have deferred the decision for now. I am looking at the new sigma 17-50 that just came out but not a lot of reviews out there...