When you start Birdfont, you have a blank canvas, which can look a little daunting. For a $10 donation, you can move up to a Birdfont with support for coloured and OTF fonts.
The difference is a measly $5/year subscription. When you first download Birdfont you need to figure if you want to produce an Open Font or commercial fonts which you can put on the market. What you need is a dedicated font design tool and Birdfont should be considered, despite the steep learning curve. Try creating an entire symbol set in Illustrator. Not only do you have to find a particular style, it then has to be carried across every character, consistently. You may be a designer, but creating fonts is an art.
