If you're just getting into it, I would recommend a 6 1/2' to 7' spinning combo. Look for one that is rated for around 12-25 lb test line and 1/2 to 2 oz. lures. You can find these ratings printed right above the handle on most factory built rods. If you're buying a combo the reel should already have been matched up to the rod.
You can go with a standard spinning reel or one that has a baitfeeder system. It may be a bit harder to find a combo with a baitfeeder reel on it. The advantage of a baitfeeder is that (as the name suggests) you can feed out line without opening the bail. You may want that feature for several reasons, such as; for livelining, chunking or chumming, or for setting out a dead bait in a rod holder or sandspike.
If you want to buy the rod and reel separately I would recommend something in a 4000 or 5000 size reel. Some examples of that size would be:
Standard reels Penn 450 or 550 SSG
Shimano Spheros 4000 or 5000FB
Okuma Stratus 40 or 50
BaitfeedersPenn Liveliner 4600L or 5600L
Shimano Baitrunner 3500 or 4500B
Okuma Avenger Baitfeeder 50
As far as price, you will usually find combos from $29.99 to $150. If you buy the rod and reel separately you will pay a little more. If you want to stay with a combo, you can probably find a "decent" one in the $60 to $100 range.
I hope this helps. Good luck with whatever you choose!
-Bob