Have no fear! I'm going to go over some of the more common inserts available through Wee Little Changes. :)
1. Hemp: A hemp insert is made from several layers of a hemp/cotton blend. The cotton helps soften and hold the hemp together. Organic cotton is often used alongside the hemp. We have FuzziBunz, which is 6 layers thick, Hemp Babies, which is 2 layers, and Joeybunz, which is also 6 layers. While I have never tried the FuzziBunz myself, I can say that I love both the Joeybunz and the Hemp Babies in conjunction with our chosen insert (I'll tell you what that is later) for times that Ian will be in his diaper longer (like naptime).
Hemp has to be prepped before it's initial use. This increases the absorbancy. You'll want to wash them separate from the rest of your diaper laundry anywhere from 3 to 5 times. Don't forget to dry them as well since this helps speed up the prep process.
One thing I love about hemp inserts is that they hold more liquid with less bulk. If you have a heavy wetter, then you may want to try these out.
2. Microfiber: This is what the bulk of the cloth diapers come with when you order a new pocket. Microfiber is fairly absorbant and so, does the job intended. Some cons? They tend to be fussier about the wash routine and so, hold on to smell a little better. The other problem is that you can't allow microfiber to touch your baby's bottom. It can cause redness and dryness. You'll have to use them IN a pocket only. I actually don't use our microfiber inserts, though I've held on to them for resale purposes.
There are several microfiber options through WLC. Flip has the Stay Dry insert made with 3 layers of microfiber and a top layer of stay-dry suede. BumGenius and FuzziBunz both have a microfiber option as well. And then there is a variation of the microfiber insert from Knickernappies. It's actually a combination of microfiber and hemp together for the ultimate stay-dry night solution. It's called the SuperDo!
3. Organic Cotton: There are several options if you want to go this way. Flip has organic inserts and so does GroVia. I have a bunch of the Flip ones and love them in conjunction with my Flip covers. I have honestly never tried stuffing a pocket with them though.
Another organic cotton option that you may not have considered is the prefold. Prefolds cost less up front for the most part and can be folded to fit where you need them. I use premium prefolds in our pockets almost exclusively. The only exception to this rule is when I add a hemp doubler to the mix. I have never had a smell problem from our prefolds. :) However, the prefolds do add bulk to the diaper area so if you don't like that look, this may not be the solution for you.
4. Disposable: This is the last insert option we have available. It's completely disposable and is great if you're a little hesitant to do fulltime cloth diapering on vacation or if you have a babysitter who is opposed to changing the disposables. I've also found that they work well on top of a prefold overnight for my son who is extremely sensitive to his own wetness. This is the only way we've found that we can cloth diaper overnight now. It's been this way for about a year at this point.
I hope this has cleared up some of the insert questions. There are so many different options out there! If you try one and hate it, then move on to a different type and try that one. There are wonderful things about all of them.