I tried to search this topic, but nothing came up that really answered my question. It might be that I am not using the search function correctly.

But, I just wanted to know what kind of rod is good for jigging. Also do you need different rods for throwing surface jigs, and a different one for yo-yoing?

I know I need a at least a 8 foot rod for jigging, but I have no idea what kind of rod to look for. I am looking to pair it up w/ Avet MXJ 6.0:1.

I would definitely have a separate rod for yo-yoing and slinging iron. On a side note, I personally don't fish anything less than 40# when fishing iron. The only exception to that is when I'm tossing small and light irons such as Tady AA lights for Calicos. For yo-yoing I would go with a short rod(less than 7'). I'd take a look at a Calstar GF765L or a WC-665H-C or, a comparable seeker.
Picking a rod for casting iron is alot more difficult. There are a bunch of things to weigh in when choosing one. The first thing I would look at is the length. The longer the rod, the longer your going to be able to cast in most cases. Something to keep in mind though is the longer the rod is the more it is going to beat you up on a fish. I personally prefer something in the 8' to 10' range. The second thing you want to think about is if you want a glass or a composite rod. Glass rods are heavier, have a slower action, and are easier to load up and take less effort to cast. Composite rods are much lighter, stiffer, and harder to load up during the cast. They also tend to shut off closer to the tip. As you can see they both have their pros and cons.
I'd goto the store and pull on a few rods to see what you like. Hope that helps answer a few questions.

Generally there are different rods used for surface verses vertical jigging. I prefer something 8' for surface iron, and fish 6 1/2-7' rods in the yoyo mode. With the reel you mentioned, I'm assuming you'll be fishing 20-30# line (that's consistent with the drag capability of the reel - prefer 20-25 on the MXJ single speed). There's a range of construction materials, 'glass verses graphite/glass construction. For surface, a Calstar 800L might be perfect for what you're doing, with the 700L being appropriate for the vertical role. Could you use the same rod for both applications? Sure, but there are advantages dropping down in length for heavy iron. In 'glass, a 270 or 270H would probably be the way to go given the line tests I've assumed.

i guess I am just going to have to get two rods then.

Just to complicate things a little--- Jig rods are also usually built as suitable for a specific weight range of jigs. I use Jigging Master rods from Korea and they have a range of rods for 100gm jigs to 500gm. To get a good action from a vertical jig requires a stiffer tip than would be used, say, for straylining. A stiffer tip means that to get the 'forgiveness' from the rest of the rod you need a more parabolic action( the weight is spread over the whole rod rather than the top 2/3 of a 'Fold-away' action strayline rod) SO......
The bad news is that unless you only intend to use one weight range of jigs then you really need a range of jig rods to match the weights you are going to use. Personally I try to be totally Brand unconscious and just use what feels good at the best price. I have a calstar 410 that I love for heavy jigging and a range of Jigging Master rods all the way down to a JM100 for 60gm jigs that I use a lot for Kingfish.
For Popping I've only ever used a Calstar 700H and am very content but can't comment on any other brand as I have not tried any.
As a general rule I use the shortest possible rod I can get away with: It makes the fight much easier and quicker and I can release fish in better condition with a better chance of survival.