Feel the Fun - First of all, make organizing and cleaning fun! Put on some music, light an aromatic candle or use a scented cleaning spray you love the smell of. If it's warm, open up some windows for some fresh air too! If you are enjoying something, chances are you will do it more often.
Empty Entry - This is often the first place that gets cluttered and is usually the first place people see when they enter your home. Have a place to put your things when you come in, so it's easy to maintain. *If where your family enters isn't the front door, keep the same organization in the room they generally enter so it doesn't get cluttered as bad either--even if guests don't see it as much. That way, whatever door you come in, it will feel good to enter an uncluttered space.
Clean Closets - You know the rules, if you haven't worn it in a year, pitch it. Go through all your closets and donate and throw out. To keep it maintained, if you add something, when you do, look for something maybe you won't use anymore. Put things up properly (like your shoes) so things don't end up in piles, too.
Purge the Pantry - Empty the pantry and wipe down all the shelves. Then, go through your food items. Donate foods you won't eat (as long as they aren't expired) and get rid of expired or stale and open things. When you put them back, keep like things together to find things easily. As you restock your pantry, put things in the areas you designated and don't over fill it. When you are shopping, if you already have a few of one thing, don't keep buying. It just takes up space, you forget things you have in there or something may expire before you get to it. Only refill when a spot is empty!
Organized Office - Start on one side of your home office and move around the room, filing, pitching and labeling as you go! Once all the clutter is cleared from your desktop, work on your digital desktop by organizing files, pictures and other odds and ends on your computer. You want to be able to find things easily on your computer like you want to find things in the office itself.
Keep the Order - Maintaining the organization doesn't need to be that hard. Spend 15 minutes a day at the end of the day, putting things away, sorting through things like junk mail and folding and putting up the laundry. A little bit each day goes a long way.
Above all, there is no reason to organize and maintain a place you don't enjoy--so after you get a space like you want, decorate it with things you love to see or add some colors or pretty organizing tools to make the space feel good. If it makes you feel good--you will want to keep it that way!