I've created a custom shout, but I can't figure out how to give/teach the shout the player in-game. I know with spells, you can just create a spell tome book that teaches a custom spell. However, you can't use a spell tome book to teach shouts apparently. Would it be possible to teach a particular shout to the player with a book using scripting perhaps? If so... how?(I'm not good with the scripting part)

This would probably work,
add a script to the book, then edit it and add in this

ScriptName  Extends ObjectReferenceShout Property MyShout AutoWordOfPower Property MyShoutWord1 AutoWordOfPower Property MyShoutWord2 AutoWordOfPower Property MyShoutWord3 AutoEVENT OnRead()  Game.UnlockWord(MyShoutWord1)  Game.UnlockWord(MyShoutWord2)  Game.UnlockWord(MyShoutWord3)  Game.GetPlayer().AddShout(MyShout)ENDEVENT

You would then need to right click on the script and go to edit properties and set myshout to your shout, the each myshoutword to the shouts words of power