K.O.
When I read this I had to respond because this was me 3 years ago! My first 2 children are 17 mo apart and we don't have family in the area either. The first couple of weeks are just hard as the sibling and you are adjusting. If your oldest still takes naps then use that time for one of your own. The best thing I ever did was get my children on a schedule and then they nap at the same time. Just remember that this is all new for your son too and he will need alot of reassurance. I used the time when the newborn slept as time with my oldest and even him helping you with throwing away diapers, getting burp rags, holding baby, will bring him into it more. Hope this helps.
I am a SAHM with a 4yr daughter, 3yr son, and 14 mo old daughter.