Fishing requires much time and does not yield much profit until its later levels. Unless you enjoy it for its own sake, avoid seriously delving into fishing until your level limit. It is not a bad idea to do a little when starting out a new character on a new server, though - the gray items you fish up sell for good money to a starter, which can help you out with your other tradeskills.
Dugis Ultimate world of WarCraft Guide installation is not impossible, nor should it deter you from using another guide; remember many are very satisfied with Dugis Guide. However in order to install Dugi’s WoW leveling guide you have to download their installer, you have to download each part of their guide individually (about 16 files).  Once you have all the installation setup files and the installer in the same folder, you execute the installers.  All the installer does is UnZip each file & place it in your Addons folder.  The process is very similar for the Macintosh.
Pick a simple goal or idea for your AddOn. It's often a good idea to just make an AddOn that only opens a window or prints a message to get started, especially when everything is new for you. After that works the way it should, and you have learned everything necessary to make an AddOn work at all, you can move on to adding one piece at a time toward your goals. Writting software in general is often a never ending process because you can always think of something new to add or improve.
Another part I like about Dugi’s leveling guide is the ease of use. You’ll be given the guide in different forms so that you can find the one that fits you. For those that like to have a printed guide alongside them he provides you with a printable and image heavy version of the guide. A very powerful system Dugi uses is his in-game leveling addon that permits you to play without having to take your focus with the game itself. The addon adds a tiny window for your World of Warcraft game that tells you what area of the guide you’re at and how to proceed next.