need advice on contact with AP!

hey, im currently a birth mother going through the private and domestic adoption process, and my birth son is due in a month. i chose the adopting parents myself and have met with them several times during this pregnancy(for dinner, dr. apmts,coffee,etc.) they have been really humble and open through this and saying that as far as birth plan and contact after birth, they would do whatever i was comfortable with. since they are new in this process, as am i, they aren't sure what's best for contact afterwards either. i know that i don't want too much contact like visits and calls once a month because i want to be able to grieve appropriately and move on with my life, as my counselor has pointed out. i also know that i have will have a strong curiosity afterwards in wanting to know how my son is doing, who he looks like, etc. i've thought about getting a letter and picture once a year on his birthday, but then the worries of which address to send to every year or if they forget one year arises. any advice would be much appreciated!!!:confused: