Hey R.. I have not personally adopted but my parents have. It surely was a lenthy process and the toll it took on my family paid a price. Don't get me wrong. Adoption is a blessing in itself and if you have any doubts about it, you're not ready to adopt. You're not married yet and you already have two kids. Trying to adopt by yourself may probably be a very difficult process. I haven't heard much about a single parent trying to adopt so I'm not so sure how that exactly works.
However, most people when they adopt they ususaly want babies. There are a lot of older kids who need those loving homes. The girl that my family adopted was 10 years old when she came to live in our house. I was 13. At first things seemed to work out well. She moved in, took the family name and things were going good. Or so we thought. Come to find out, the girl (I'll call her Sam) ended up having a lot of emotional issues that she carried from her birth family. We were not aware of any of these problems she had. She actually had bi-polar manic depressive disorder and a lot of authority disorders. We did not know this because of our case worker. Basically long story short, our case worker was pushing my parents to adopt and did not tell them the whole true story of why Sam was up for adoption. We found out a lot of Sam's problems through family therapy and just trial and error. But what basically happened was after 6 long years of Sam living with my family, my parents had to terminate the adoption and send her to a group home till she was of legal age. She lived in a group home for only two years. Once she turned 18, she moved out of the state to live her birth dad who she thought was dead all her life. (Just one of the many messed up things that Sam's birth family told her.)
I don't want to scare you off by the idea of adopting a child who needs a home. But before you make that choice, you should know the good and bad of adoption. Find yourself a good case worker. Not one that is just trying to push kids through the system. Because that was the case with my parents. We got handed a raw deal and paid a huge price for it. More than money can ever pay back. Just make sure you are ready to go through the entire process cause you will have a check list of things that you have to go by. I can't remember everything, but adoption agencies do all kinds of checks on you, your house, your ability to be a good parent.
Also, get a complete background history of where your child will be coming from. Get any and all information, as much as you can. Educate yourself with every resource possible. You don't want to go blindly into this. There are people out there who will take advantage of good people just trying to help out in this world.
The best thing for you to do is know your subject. Be educated on what you want. And find the best case worker for you who will help you find the best kid to fit with your family. You will be taking a chance, but it's a chance you have to weigh with your family. I wish you luck and hope you find what your looking for. And may you blessed with opening your home to someone who needs one.