Hi, I was adopted at the age of about one year, and I pondered the same questions as yourself. I put and advert on www.friendsreunited.co.uk
after having put what little I knew about my family tree on the site. And a while later Two sisters got in touch and also put me in contact with a brother in Liverpool. If I can help you in any way PM me. I also registered on the adoption register as mentioned above, but in my case to no avail.