I've been playing guild for a little while, unfortunately I own the Oretagas yet so i can't quite give advice for them but I could give some general Guild advice.
The Peacekeeper is the only model you mentioned that I own and it is pretty great but a costly point investment. If you ever pick up Nellie he works realyl well with her (as just about any model with a strong melee attack).
Guild can often end up feeling like an elite army depending on the match up and how many big models you bring. There are plenty of games i've played against Gremlins where its been my 7 models against 10 or 11. In those cases you better stick to your guns (no pun intended). What you need to learn about the Guild is that generally they dont do as many fancy tricks as other factions and you're not that durable. What you do get however is good reliable damage, and depending on your models, some interesting scheme marker manipulation.
Do you have any friends who are interested in joining? If so, i would recommend splitting the started box with them as it comes with Guild and Neverborn models and the ones you get are really good.
