[Droid X General] thepolishguy:
First off- that is a lot to bite off as an opener. lol. I have to get in a minute- plus I am a newb as well but here a couple of things...

1) You sound pretty on track. Root gives you access to more options with your phone. It also voids your warranty.

2) Flashing. A term used loosely. Normally it is used in conjunction with "flashing a rom". It simply means to install something (basically).

3) Rom. It is the image (not in the photo-graphical sense) that is embedded/burned on your phones hard drive with all the information of your operating system. For instance: you are on the stock 2.2 ota "rom". But you could "flash" the new "AOSP rom" that was just released. That means you would be removing the factory image that came on your phone and replacing it with a modified image. Theme's and .apk's -those are not "burned" into the phone. If you do a factory reset- those will be wiped. The rom image stays put. If you flash from 2.2 ota to AOSP and then did a factory reset- you would not return to the original state your phone came from Motorola bc that image is completely removed and replaced by the new image you flash. Instead you would return to a clean AOSP.

4) .apk's - .apk is simply the name of the file extension used for android applications. I came from Windows Mobile and they were called .cabs. So any app can be referred to as an .apk. You can download an apk from XDA, place it on your sdcard, tap the file, and i think you will be prompted with "do you want to install" (some where along those lines). There is a setting in the "Settings" that allows you to install 3rd party (non-market) .apk's.

5)Installing themes. This refers to modifying the images (and this time I do mean in the graphic sense) of certain .apk's and other whatchamajiggies. You can install a simple theme that just changes your lockscreen, or you can install a huge theme that changes almost every part of every image so the entire phone looks similar. Here is the tricky part about using themes- your phone has to be deodexed.

deodexed. When you get your phone all of the system files come with a few different parts to them. One of those parts is an odexed file. Apparently the theme building types do not like working with these files so they run this process called de-odexing in which all of the system files are somehow manipulated in a way where they no longer need their odex file. So you end up "de-odexed". There is a program called "xultimate 2.2" that enables regular folk like you and me to deodex our phones. I tried running it yesterday and it errored out on me. So I used another method that worked fine. There are some threads on here about deodexing- if you want themes you will have to do it.

6) locating and moving downloaded content. When you have root you can get Root Explorer from the market. I am sure there are other good file exploreres- but I can't speak to them- I use Root Explorer. As far as locating downloaded content- whenever I download something from my phone, it always (normally) goes to /sdcard/downloads. If it is not there, I guess you just do a search for it. If you want to move it- long press the item, copy, move.

And you will need to google "ADB" (android device bridge). Many of these activities will require the use of ADB. You plug in your phone through USB (make sure phone settings are set to "USB debugging") and... well there is just way to much on this one. Google this one and you will find a lot of stuff- or search it here on XDA

have a great weekend. got to go.