Sometimes a room so full that you cannot even get in to it. The first thing you should do is take out the trash and take out what is obviously for donation. Don’t spend a lot of time here deciding what is what, only do what is obvious at first. This will make room for you to start sorting and organizing and you will get imminent gratification seeing your progress and making space. Then you can start separating things that are alike and putting them into piles or stacks to organize and put away.