About that pre-installed software you mentioned: none of it is legal, I'm afraid, unless you also received the original DVDs and a letter of transfer for the software. Adobe isn't supporting CS5 anymore, Microsoft will probably report you if you try to get support from them, Apple ditto, and you'll never be able to upgrade any of those programs of course since you don't own them.
The good news is that Pages/Numbers/Keynote can be purchased for cheap. FCP is super-cheap for what it does, but it costs $300.
Now, about that model: there are two models that fit the scant description you've given us (look over to your left under my name to see what kind of a description we were actually looking for, and add yours to your profile for future reference): a 2.0 GHz white MacBook, or a 2.13GHz white MacBook. They're quite similar but a little different. It would be helpful to know exactly which one it is.
In either case, you can max out the RAM to 6GB, and I would **strongly** recommend you do so at your first convenience, as between the very weak graphics subsystem in these models and the low RAM you have, Yosemite is going to run rather poorly.
I'd also suggest that you're going to want to get either an external drive or upgrade the internal boot drive (fortunately, very easy to do) asap, as you're going to run out of HD space very quickly with a mere 160GB drive. You might consider (when finances allow) upgrading to a 256GB or larger SSD, and this will be far faster and make the machine perform (along with the RAM upgrade) more comparably to recent machines.
I'm not sure where you're looking for RAM prices, but Amazon in the US would suggest that 4GB module should cost you about $35:
Amazon.com: 4Gb 1066Mhz Ddr3
and the single 2GB chip you'll also need to max out the RAM costs around $22:
Amazon.com: 2Gb 1066Mhz Ddr3
This doesn't seem pricey to me.
Bear in mind that this machine is almost six years old now, and will perform like it (barring the addition of an SSD and maxing out the RAM). I'm glad you're off to a good start with it, but I hope you are successful enough to move up to a more recent model soon.