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You would probably be best off with an editor like Sigil or the Calibre editor. Those will handle several things for you. In short, this is what needs to be done.
1. Add the font(s) to the ePUB (it is a zip, but add, do not remake if you have not done it before)
2. Add the font to the OPF file
3. Ensure the font is defined in the stylesheet (@font-face) and actually used for certain classes (font-family)
4. Ensure the classes are used in the actual XHTML files by using the classes and the stylesheet.
An editor will help you with 1, 2 and partially with 4.
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