Prismacolors are my staple marker, but my advice to you is to wait and practice with something cheaper because they will eat away at your wallet like there is no tomorrow. Prismas dry /very/ quickly and it takes a skilled hand to use them correctly (I've been using them for five years and still have not mastered coloring in large areas). They are also very finicky and like to be kept in exactly the right temperature and condition or else they will bleed all over the place or dry out or both.
Blending markers don't blend, they are made of the same substance of the rest of the markers except they are (mostly) clear. Their job is to dilute the colored markers and is usually used as a base before the colors are put on to spread them as you lay them down (like putting water on watercolors) thus making them blend. If you put them on top of your colors you will end up with bleached splotches with dark circles outlining them. /Not good/.
Not to put you off, prismas are wonderful markers when used correctly. Their colors are so juicy and if you've got the right hands then they create some wonderful images. But unless you are confident I would suggest working with a cheaper alcohol based marker, or buying a few colors to mess around with (skin tones and the like not the primary colors or you'll get nowhere).
Here is an example of what prismas can do:
The lines made were honestly, not intentional. But I think they really added something to the picture. The blue in the background was made afterwards in photoshop.
It isn't my best work, but is the only image I have on me of my prisma work (going from one state to another on a plane doesn't leave much room for packing when you only have four suitcases to hold all your possessions :\).
Hope I helped. If you have any more questions feel free to pm me.