Creating Fonts

How difficult is it to create a font set from a set of characters? I ask because, with the help of Zhu Bajiee, there is now a script for the Onha language of my Secrets of sha-Arthan  setting and I'd like to make wide use of it in the production of the game. Having a custom Onha font set would help with this considerably.
However, as is usually the case in these matters, my technical know-how is exceedingly limited. I don't know the first thing about the creation of fonts, which is why I'm prevailing upon my readers to point me in the right direction. 

Thanks in advance!