Hi, Laura, and welcome.
You've got a great starter kit there, and in particular that superzoom is an excellent way to try out a whole lot of focal lengths before you go chasing expensive new prime lenses.
@bobbotron beat me to it, but if you are willing to dare the undiscovered country of manual focus and manual exposure, not every lens need be new and expensive. Pentax's range of old lenses is vast and awesome, there are some real gems out there in pawnshops, garage sales and online to be had absolutely dirt cheap if you
know what to look for, and the best thing is that
Pentax DSLRs can use all of them. And that's before we get to Ricoh and Chinon lenses, ALL of which are compatible with Pentax (but be careful of Rikenon P lenses and third party lenses marked PK/A-R;
they have an issue with sometimes getting jammed on the camera).
If you want macro and you can pick up a cheap manual-focus prime lens (a 50mm prime lens is always a good investment and learning tool) and want to experiment for yourself,
here is a very good way to get macro capability at a rock bottom price. At that point, though, you'll also be wanting a tripod which, if you haven't already got one, is the next thing you should buy after a camera and first lens.