Buy one of the beers, fill up your hydrometer tube and let it degas for a few days and then take a FG reading..you can back into attenuation with the ingredient list you have.
Using wlp001 or 002 would probably be just fine. If the recipe has a lot of unfermentable sugars use 001 or if it doesn't and you are looking for some body use 002.
If you post the recipe I can be more helpful..plus I'd love to see it.
Kegged and serving -Rye IPA, Kohatu Pale Ale, Brown Forge, Marilla Wheat
Bottled: Too many to list
Fermenting: Flanders Red, Solera Lambic, Sour Rye Solera, Consecration, Apfelwein, Apple Cider, Nelson Saison, Sage Saison, Farmhouse Brett Saison, Little Bo Pils, It's a Celebration Bitches