Hi marea and welcome to the forums! I would echo the suggestion for the DA 55-300mm. I'd say that's enough lenses for an beginner. Not that you can't handle more, but more because if you are new, you really don't know what focal length ranges you REALLY like to shoot in. To that problem there is a nifty solution. There is a small little program FREE!!! called Exposure Plot that looks at all the photos you give it and sorts them by focal length, f/stop, aperture etc. It's a great tool in helping you decide where you want to go next. Linky
here. Other than that I'd also recommend a rocket blower, extra batteries (enloops are more expensive but are the best and will save you LOTS of headaches) couple 3 SD cards (get good quality ones, nothing worse than losing pics because a card went south). Camera bags are so much personal preference that I can't recommend one to you. What I like you may hate and vice versa. A good flash is good, but I'd get used to my camera and shooting with it first. One final recommendation: Brian Peterson's book
Understanding Exposure of all my gear and stuff and online sites and the whole of it, I think that book helped my shooting more than any other single purchase/gift.
So here is my recommendation, keeping in mind your budget.
1.
Understanding Exposure
2. Download "Exposure Plot" (it's FREE!!!!!)
3. Rocket Blower
4. Enloops batteries
5. Sandisk SD card (or other "good" card, make sure you get the real deal, there are lots of substandard fakes out there...especially on eek bay)
6. Pentax DA 55-300mm lens.
NaCl(good luck, have fun and post your shots!)H2O
PS: Like your shots!