Being an Elf with the Dream Speaker Trait will add a +1 racial bonus to your Sleep effect DCs.
Honeyed Words Trait (drop Two-World Magic, since Lullaby a standard action that allows a will save) which will get you another +1.
That should get a you a DC of 19 at first level. Just by using Slumber Hex.
At level 1, it might be ok to have 2 cure light wounds prepped, but you are going want to switch to a Wand of Cure Light Wounds (or better yet Infernal Healing) and heal people outside of combat as soon as possible. For combat my level 1 spells were Ear-Piercing Scream (target a different save and Daze is basically "lose all your actions") and Enlarge Person (to help the party meatshield deal more damage and threaten more AoOs). Ill-Omen is another good choice, but since it requires set-up it works best with another caster who uses Save or Dies at level 1 (and is just the best with a Color Spray caster). I highly recommend the Summon Monster spells starting around Summon Monster 2-3 as just a general recommendation.
Ya, Accursed Hex, while very very good, can wait since Dreamspeaker is a +1 to save dc you can't get otherwise. Also you have Elven Magic for +2 against SR and can (and should) swap weapon familiarity for Arcane Focus for +2 to concentration checks. Alternatively, you can trade keen senses and weapon familiarity for Fleet-footed for a +2 to initiative. Both are good, but I probably recommend Fleet-footed. And hey... that Run feat may one day come in handy!