Buying filters for the first time

I am going to pick up a few filters just to learn with. I currently have two lenses the 50mm 1.8 and a 19-35 Tokina (Quanteray) I know these lenses aren't the best and the filters will cost as much as the lenses, but I guess you've got to start somewhere.

I am planning of getting a circular polarizer for the wide angle and maybe a few ND grad filters for both lenses. I've been shooting outdoors in bright sunlight etc. and am hoping the filters will help. If I'm way off here please let me know.

So is this a good idea, or should I be going in another direction?

First off, the 50/1.8 is a great lens! Don't knock it

A circular polarizer is a great idea, it adds an extra dimension to a lot of shots (I blogged about them here) and definitely helps in glare-y situations. An ND grad filter is quite specialized - it really depends on the type of shot you're taking. I'd perhaps start with the circ polarizer and see how you get on.

Circ filter will go well with that lens. I just bought myself a nifty 50 as some like to call it and I haven't realy had time to play yet but You should have a circ. pol. filter in your kit. it's cheap and works well.

I believe that the filter thread ring rotates when you change focus with the Canon 50mm f/1.8. If this is true, then you may have some problems using a polarizing filter with it. The reason for this is that a polarizing filter must be rotated to select the amount of effect you want it to have on the image. If you set the filter's position and then the camera adjusts the focus, your filter setting will be changed. Readjusting the filter could again upset the focus. It's potentially a never-ending fight.

Bottom line - it is much better to use lenses with non-rotating front elements if you intend to use a polarizing filter.

This is true for any type of polarizing filter. The difference between choosing to use "circular" and "linear" polarizers is related to the effect a linear polarizer could have on autofocus systems. For all autofocus cameras, you should choose a circular polarizer. Both linear and circular polarizers are round and both need to be rotated in their mounts to optimize the effect.