Hi richie, I'm assuming it's lure fishing rather than bait fishing you're interested in, based on the links you put up there?
Im a relative newcomer to fishing myself, but I'm a little further down the line than you are, so I'll do my best to answer your questions . . .
Firstly, the 2000,4000 etc are sizes of reel. A 4000 holds more line than a 2000, but will be physically larger and will weigh more.
Maddeningly, reel sizes are not standard, but vary from manufacturer to manufacturer i.e. a Daiwa 2500 reel is the same size approximately as a Shimano 3000 reel (I think!)! For lure fishing you do not need a large line capacity (as you won't be casting that far) so anything from 1500 to 4000 will do. When you are looking at a reels specs you will see exactly how much line it will take. I myself have a 4000 reel , which some people might think a bit big for lure fishing, but its a lovely reel and it is grand and light and goes well with my particular rod. Personal preference is a lot of it.
Rod: That rod looks OK, but I had a Rovex rod and it was poker-stiff and more suited to boat fishing (jigging) than casting the quite light lures and soft plastics used for bass fishing. The rovex rod I had (not the exact same model, but it was weighted 20-40g) was quite poor at casting, I found.
Browsing through the forum, you will see the same names pop up time and again for good budget spinning rods: Surecatch Salty, Shimano Vengeance, there are plenty more if you have a browse. I myself have an Abu Devil 10-30g which has served me well and costs around €25! I have landed decent fish with it, and there are a good few other people on the forum who have one and are happy with it.
As I say, I am a relative novice at this game, this forum is full of very experienced people who I'm sure will give you better/more relvant advice than me!
Hope I've been of some help!