Personal Sound/Mixing Board?

Start with the Behringers they are great budget boards with ok quality and you wont beat the price. I have 5 of them for small jobs and home use they work great. But unless your church is using a very small board like one of the 502s you aren't really going to learn much more than the signal routing, gain and simple 2 band eq. My suggestion is spend as much time tinkering with the board the church has if the system was installed right then you should not need to play with anything past the console. If they have 31 bands or a system processor installed take a picture of the settings or make a backup (if digital) of them some how so that when you are ready to tinker with outboard possessing you can revert it easily. Start by learning how to set a gain on a mic properly. Then move on to using the eq most older and smaller boards are a 3 or 4 band with a fixed high and low and 1 or 2 sweepable mids some have low pass filers as well. If you will be using the monitor outs play with those as well. You did not say but if it is a digital board this can be more difficult to learn audio is one of the few places were i recommend people start with analog and move into digital as the new digital consoles have gates and compression and tons of routing options. The thing that took me the longest to learn was what types of mics to use and were that took a good 3 years of playing with tons of different mics and tinkering. Here is one very good resource for information mixonline.com they have guides that can help a lot as well as tons of other information.

For the most part all the boards in the xenyx series are great for the $. I am fairly familiar with the GL2400 its not an overly complicated board and has decent preamps.