I think it is an excellent idea to start off slowly and doing shorter day hikes until you are more comfortable walking longer distances. If it is a big problem to carry a heavy backpack, you can still enjoy the outdoors by making use of hiking inns. See http://ezinearticles.com/?Hiking-Inns&id=7411931. Hope you get to enjoy a hiking trip real soon!
May every hiking and camping experience be a fun adventure!