Yep..do kinda need to know if you're looking for a screw on or a glue on head.
Also, it's important to know what type of game you're after. For deer you can use about anything, for elk, bear, or bigger things you might want a smaller cut head.
Straight edged 2 blades are generally easier to sharpen with a file.
3 blades are really pretty easy too.
With 3 blades you don't need to worry about keeping a consistent angle. I have some instructions for sharpening 3 blades that I got from a pro that I'll be happy to email you if you want....made sharpening 3 blades a breeze for me.
I like zwickeys for cost and effectiveness....but I can't really recommend them to someone worried about their sharpening skills. They need quite a bit more work out of the package to get sharp.
Learning to sharpen by hand with a file and stones is a REALLY good skill to learn.
..but that aside..an $8 accusharp tool is super easy to use and works very well on double bevel 2 blades...and it doesn't matter if the blades have a curve to them or not.
There's no reason to break the bank..
Eclipse heads come with a nice factory grind.
Tuskers are pretty good heads that don't have the tri lam tip that can add a little frustration to a beginner sharpener.
I truly can't think of an easier combination than a tusker head sharpened with a accusharp.
Here's an A+ place to get them
http://www.braveheartarchery.us/tusker_broadheads.htm Hope it helps.