First things first.
you should know that what one set of key binds for one person might work brilliantly for them, for you it may feel completely wrong.
also going from being a clicker to a key binder is a process best learned over time, or you will not only confuse yourself you will get angry and fall back to just clicking.
Right now that is out the way.
Start off by binding the spell you use the most to be in the most comfortable place for you, For me being dest lock incinerate is bound to 2.
Get used to how it feels, might take 2 mins, might take 2 hours. best thing to do is go hit a dummy for a bit whilst jumping around and switching targets, this is not about getting your DPS up, its about getting use to the bind and muscle memory.
once your completely happy with knowing where your most used spell is and you can get to it whilst moving without looking at the keybord then it's time for the next most used spell, Bind it, rinse & repeat the above until you are totally happy where it is, and you can activate it without looking at the keyboard.
There is no quick and easy way to learning to key bind all your spells, anyone who says there is, is lying to you. Sure the more you do it the faster you will get at setting up and remembering spells per key-bind, but at the start, when your just learning it is a time consuming (but very rewarding) process.