I usually hate to ask for help, so when my friends all surprised me by taking turns bringing us meals for 2 weeks after my 4th child was born I was blown away. I was so relieved to have help. 
That is so exciting, congratulations! We moved 17 hours away from family, so having a great group of friends is really important to us. 
Get involved in something. Church, a social club for interests you are in. I don't recommend parent groups, for some reason they get really nasty. Just find a way to connect with people. Having children is so much harder without a support system!