Easy part first: Your spellbook doesn't fill up, so you don't really need to delete any spells.
That said, what's limiting you is probably that you're out of Magic Crystals, which you need to be able to scribe spells into your spellbook, and also to upgrade them if you increase your magic skills (if you open your book, the total crystals you currently have is shown on the left side).
There is a limited number of crystals to be found (locations are determined at the start of a new game), but since you're pretty early on yet, you might still be able to find enough if you just keep playing. On the other hand, you're still at a pretty early point in the game, so it won't take you long to get back up to where you are now.
Note that there is a certain place you'll come across during the main quest where you'll be able to buy Crystals (as well as skill runes) for 100k gold a piece.
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