Some Adoption Questions

I have some questions about adopting. I have just gotten married in february. Though me and my now husband have been living together for three years. We are interested in adoption down the road at some point How long do you have to be married before you can adopt a child? We are hopefully going to be able to adopt a child from an infant up to 5 years old. Also are you able to adopt a child if you have some sort of special need's(We are both on something called aish) but we don't fully have any issues like down-syndrome or anything like that. My husband never learned to read or write and i just am a very shy type of person. As well is there a certain age someone can adopt? I am going to be 24 and my husband is going to be 30 in july(both of us) but we won't really be considering it until we are able to talk to our families about how they would feel about if we adopted a child.