To me, at lower levels misfortune way outweighs evil eye if you have cackle. So my 3 would be cackle, misfortune, and slumber.
As for feats, I would say toughness, great fortitude, and improved great fort. If human I would also get extra traits.
With traits, I would go for any and all of the save boosting traits.
Spells with the witch are purely at your discretion. With them dipping in arcane and divine you have lots of options.
As far as gear, get scrolls to put into your familiar. Every dime on scrolls for the familiar, or to keep some backups. Remember, you don't have the wizard drawback of paying to scribe scrolls into your book. Load that beastie up.
