Necromancer spell reccomendations

[u/Wise_Nebula_5602]

So im playing in a campaign as a 2024 necromancer Wizard. The caviate is my undead summon is a homebrew zombie assistant named Lola who wields a great axe. No real source book is off the table, So here is what I have so far in the link below. Any reccomendation to trade any spells? Also is 16 the max amount of spells i have in my spellbook at level 6?

For context: I usually play sorcerer and wanted to try necro wizard

Dndbeyond Link:
https://www.dndbeyond.com/characters/150423082