I have had a close relationship with my equipment for the past 40 years. For almost 30 of those, I've employed the technique I'll describe below.
My regular and by far preferred method of masturbation is to use a condom. The brand and type will largely be a matter of personal preference. I would encourage you to try different ones. My current favorite is Crown Skinless Skin. To begin, I put a few drops of lube (KY liquid or equivalent) INSIDE the condom before putting it on. The lube will not dry out or disappear as it is contained in the condom. This method feels much as if you are in a warm wet vagina. Additionally, the condom ring at the base of my member serves as a bit of a cock ring to help keep me hard. Another benefit of this method is there is no mess or clean-up after orgasm-no cum anywhere or greasy hand.
Occasionally, I will put the lube on the outside for variety, but my favorite is inside.
While I am not a fan of using a condom while having intercourse, it is the way to go for self pleasure. Experiment and let the site know what you think.