I would say, since you don't seem to have any experience/knowledge (no offense meant) of scopes, to start looking at some videos on youtube for basic info, hit up Google for optic reviews, go to dealer sites like midwayusa.com and read customer reviews. That would be a good start.
If you don't have alot of money for a scope, try to stick with well known companies, they all offer cheaper scopes too ie. Burris, Nikon, Redfield, Pentax, Leupold, Tasco, Bushnell...and they offer pretty good glass too.
Don't jump for a scope too quickly. Make sure you know what you need first and then want.
From what I've read on them mostly good.....
Best advice so far - unfortunately, we don't have a lot of Brick/Mortar places to buy tons of different brands/models of various scopes so you'll likely not get a chance to try them out in person. Thank goodness it's 2013 and the internet has a lot of places that thoroughly review stuff (be careful because there's also a lot of BS out there by folks who claim to be experts).
Think about a few things before you even start to look at various scopes:
What type of gun is this scope going on (make/model/caliber/barrel-length/)?
What you want to do with the gun that the scope is going to go on (compete, plink, target-shoot, hunt, etc.)?
What is the shortest/longest distance you will want to use the gun?
What conditions will you be shooting (light/dark/cloudy/sunny)?
How durable will this need to be (is it on a gun you're going to keep in the safe and only get out on rare occasions to the range, or are you going to be dragging it around on an Elk hunt, etc.)?
How much do you want to spend (you want to get a good value either way - something you will be happy with, but that you can re-sell if you aren't happy)?