Do I need pallets / where do I get this from? Please help

No, you don’t have to send it in on pallets.
But for that kind of quantity, it will probably be considerably cheaper to do so.

As to where you get pallets from etc, it’s no different than buying boxes to pack them. You find somewhere that sells them and buy them.
You then pack your pallets and wrap them in clear pallet wrap ready for collection.
However, if you are sending from a residential property, then you will struggle to find a pallet company that will collect from you. Never mind that you probably won’t have anywhere to put them whilst waiting for collection.