One of the things that you can do is get some professional help in the form of a local house clearance company or removal company to help you out.
By doing this, all of the heavy lifting and boxing up will be taken care of. You will not have the need to purchase packing items like tape, carboard boxes and bubble wrap to protect your valuables and glass items.
You will need find out how much stuff that have to move to the new property. This will enable the company doing the work to give you a fairly accurate quote for the work.
The best way to start is to separate everything into groups. You will need a section that you are taking with you, a pile that needs to be thrown out and if you have anything that is useable but not wanted you can ever recycle, or give away to a charity organisation. You may even want to sell some stuff for a bit of extra cash.
The best way to find a competent removal company would be to use the search engines to find a company that is local to you.
Get a few quotes beforehand and judge which gives you the best value for money. You will also need a date for the move that everything has to be completed by.