Finding hunting land etc is a whole other thread. Here is Oregon's website for dept. of fish and game:
http://www.dfw.state.or.us/resources/hunting/index.asp
Their you can find info on taking a hunting safety course(required to hunt) and able to purchase hunting permits, etc and gain more info on hunting in your area. If you can make friends with a local hunter that will be a big help with figuring things out, learning the ropes, local hunting, etc. You can also call your dept. of fish and game and they will help walk you through the process and guide you in the right direction for public land hunting. Preference between bow and rifle is a personal choice and you can do both. Bow season tends to be longer as it is more challenging. Both your current rifle and bow are great for deer hunting.