We went down this road, too. A 14 months we found out our son was allergic to peanuts and most everything else.
Here are some things that I have done since we found he was allergic.
First, and foremost, get an epi-pen! Just having that with Joey all the time, gave me a little peace of mind. We get the script refilled every year (insurance pays for it), and as long as the fluid inside the pen is clear, you can continue to keep them on hand, even after a year. So, now we have them EVERYWHERE. The car, his class, his back pack, the kitchen cabinets, my purse. At least that way I know, if he does get ahold of something he shouldnt, I can help him.
Also, keep Benadryl in the house. Those single dose Benadryls are WONDERFUL.
Second thing I did, was get a medical alert bracelet. It has his name, address, my cell #, his drs name and number and lists all his food allergies.
Look here: http://www.laurenshope.com/
I cant remember the exact website I bought mine from, b/c it was so long ago, but there are plenty of sites that sell them at a reasonable price.
If he is ever separated from you, and has a reaction. It could be a lifesaver!
I also found this site: http://www.cafepress.com/allergyalert
They have cute bibs, shirts, buttons etc that all have peanut allergy alert on them.
We live in a strict peanut and nut free home. No nuts are allowed. Period.
I read every ingredient of everything I buy. After you buy things a few times, you will know which products are safe, and what arent. Although, companies can change ingredients on a whim, so you always have to give the ingredients a quick once over.
The tricky part is outside food. You never know with baked goods, pot lucks, restaurants, etc. I keep a stash of Joey-approved snacks in his back pack at all times. And whenever we goto a b-day party, I bring a Joey-approved cupcake, incase the ingredients on the cake are not available.
You will find that most people will be very understanding and accommodating when you tell them about the allergy.
As far as new foods go, take it slow. Watch for reactions. Wait a few days before you introduce something else.
After a year, have him retested. Joey's peanut level went way down in a years time. His skin test still showed a reaction...We are hopeful he will grow out of it.
Best of luck!!