HeroForge and related documents is a set of tools to help you quickly make a character without having to manually do all that math. When you are finished with the bulk of it the document creates pretty character sheet pages you can print out and use.
I would recommend using HeroForge 18.104.22.168 for your character. Anyone that is familiar with this document may notice the lack of the spell book page. This has been moved to SpellForge and the animal companion page is now Animal Companion Forge.
Those 3 sheets are the only ones you should really need to play. If you do use them, they make HEAVY use of macros so make sure you enable them for that sheet!