1. Mask
There is nothing worse than having a mask that fogs up and spoils your dive experience or keeps leaking. Choosing a mask is a personal thing, go for quality over anything else. A good quality mask should last you for years, and if you wear glasses or contact lenses you can get special corrective lenses applied to your mask. A good quality mask should have a good soft silicone skirt. It all makes for a better diving experience, easier to clear and then you focus on the good stuff, i.e. the dive. If you can manage to get a good fitting mask prior to your open water course, it will make life even easier. If you go to a physical dive shop the staff will be more than happy to help you chose a good quality mask that fits. If you go for the online option, most online shops will again be happy to help. I have had a great experience with www.scubadivestore.co.uk. I use the Apex VX1. Great mask, easy to clear and super soft silicone