Staying clutter free is a never-ending battle, but staying on top of it is half the war.Learning new habbits that will  help you is also tricky. Try little things at first like putting a basket or hooks by the main door for keys, maybe a place for mail right there too.

Keep a trash can near wherever you sort your mail, so the junk mail is thrown away, perhaps keep a shredder there too to protect your identity. 

Create activity baskets with all the supplies needed all in one spot, paying bills- have a basket with stamps, pens, calculator, etc. Have vitamins/pills- write on the lids how many you are to take each time, turn them upside down when they are empty.

There are lots of little things to help get you on the right path of de-clutter and organization!