This process might be one option.
You could use the IcoMoon App. Their library includes FontAwesome which would get you off to a quick start, or you download glyphicon, and upload the fontawesome-webfont.svg
For your custom icons, create SVGs, upload them to IcoMoon and add them to the FontAwesome / Glyphicon set.
When you are finished export the font set and load it as you would any icon font.
Good luck!
UPDATE
If your imported SVG file icons seem misaligned after importing into the iconmoom.app, first check how they actually look when used on a web page. It seems to me that the preview may not always be perfect. Alternatively, there is an edit icon in the iconmoon.app tool bar which lets you move and resize.
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