The Nikkor 60mm Macro is a fine lens. If you want a little more reach, the Tamron 90mm Macro is hard to beat. All three shots above are from the Tamron 90mm Macro. Sigma makes a really nice one that is over 100mm...can't remember exactly what it is...150mm maybe.
And do yourself a favor and grab a 50mm f/1.8 aka the Thrifty Fifty. IMO that is one lens that should be in every Nikon DSLR shooter's bag. You can find them for $100 or less and they are fantastic.
Editing, look at Gimp...it is comparable to PS but it's free. You can also get Photoshop Elements for not much money. Commonly for less than $50. It's just a watered down PS but has all the main things you need to do processing. I personally like Light Room but it's costly. You might be able to grab an old version of Nikon Capture for cheap or even a newer version from someone that doesn't need it. Capture NX2 is an excellent program that is included with some Nikon cameras and much of the time, people that buy them are using PS and sell off the Capture program cheap.
Camera Pimp member #1