Dr Sears has a good series of books- the Pregnancy Book for starters, also has the Birth Book and the Baby Book for the next stages.
check out ImaMother website, probably will get more advice there from those in the know.
If you are not yet taking folate supplements, start ASAP.
Interview a few to find someone who you are comfortable with and who shares your goals for the birth. Worth every penny! Statistics show births with doulas have fewer complications, fewer c-sections, and more positive memories.