Declutter
Decluttering is more important here than in any other room. Many garage items have not been used for a while: children’s toys, unused tools, broken furniture, bags of dog food. Group items into unusable throwaways, quality items that can be donated or sold, and those you need. The more you get rid of, the easier it will be to pack and the cheaper the move. See decluttering.
Where to sell or donate your stuff
The original article said the most popular remain Facebook and Craigslist. Place items up early so you can sell them before packing day. If you cannot get a good price, lower it — some money is better than none. Check charities that accept donations.
Packing your garage
Label and pack items according to where you would like them unpacked. You may not have storage in your new home. Put similar items together, such as fragile items and glassware in properly labelled boxes. Electronics should be placed together with cables in the corresponding boxes. If you need packing items, get in touch. Storage can hold overflow. Get a quote.

