If you have 1 level 70 and thats it - then your options are pretty much level up or have a character leveled up for you.
Your 70 alt can heal but can't damage or it will leech XP.
The best way is to level two all the way to 70 dual boxing them together. That is what I did with the Zins, leveled all 5 to 60 at the same time.
Failing that, you can quest most of the way to 60 within about 5 - 6 days /played if you know the quest order and are already familiar with that factions leveling up. There are a few guides out there - I like Joana's guide the most - I have a copy of it and it is pretty solid. Not geared towards boxing but will certainly get you leveled quickly. It is mostly quest based.
http://www.joanasworld.com/
Mage/Mage will be the easiest to control. You would just be duplicating functions plus controlling movement and individual things that would need to be triggered (ice block, etc). Adding a second class makes things much harder - two sets of spells - less overlap, etc. Mage priest is not as solid as you might think if the priest is holy. 1 holy priest can tend to 3 or 4 characters at once, especially with aoe healing - and holy priest dps is fairly weak.
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