If you have no time to do serious organizing, this is a quick strategy to tidy up at least 1 room. I personally use 4 plastic storage totes and 2 cardboard boxes (ususally courtesy of Amazon).
2. Label containers:
Cardboard box 1: Throw away/recycling (out it goes today)
Cardboard box 2: Give away (fill with items for charity, put in car trunk immediately)
Plastic bin 1: stow away (stuff you can't think about and don't want to deal with right now, put in basement or garage. Plan a date on your calendar to revisit this bin. If you haven't done so by the end of the summer, throw items away, donate, or recycle)
Plastic bin 2: put away (stuff that ended up in the wrong room, put in correct place at end of this task)
Plastic bin 3: store away (seasonal or infrequently used stuff, put bin in basement or garage)
Plastic bin 4: sell (ebay, consignment, garage sale, must sell by end of the season or you never will)
Finish one room completely; it might take 30 minutes to 3 hours depending on how cluttered your room is.
Do NOT let boxes sit in the room. You deserve a clean and tidy spot after all your work!