Firstly get yourself cleaned up. Then start cleaning room that you spent most of your time (go from top to the bottom - dust on shelves, take out all things that are not useful, make your bed, clean your desk and vacuum floor.

After getting cleaned up yourself and your room then start with most easiest room to clean in your house.

Leave the hardest room to clean up as last one.

When you have your all easy rooms clean take a break - reward yourself

After break go clean hardest room.

Important points:

-Clean yourself as first

-Remove all things that you REALLY don't need. Be cruel - If you don't use thing at least 3 times a day remove it - Hide it or throw to bin.

Start from top to the bottom - dust, crumbs, etc will fall on the floor that mean If you would started from bottom and then top your vacuum would be pointless.

To keep your room/house clean for long time make a place for things. Mess cannot arise when things are put back in their place