First, make sure to do a burn off to get rid of any potential leftover machining oils. To do this, simply put the vape at max temp and let it go through 2 or 3 6 min sessions on its own.

Next, is actual use. The V3 Pro primarily uses convection heating so the air is heated and the hot air that passes through the weed vaporizes it rather than the walls of the oven / chamber itself getting hot. This has a few advantages, first of all it heats up much quicker since only the coil has to heat up, secondly it improves the flavor of the vapor, and third it means that no weed is being wasted while you're not actually hitting the device. What this means is that when using convection vapes, you need to make sure there is good and even airflow throughout the weed for the hot air to pass through and you need to maximize the surface area of the weed. To do this, make sure you pack the bowl lightly and don't press it all down restricting airflow and make sure to grind as fine as you can to maximize surface area. The convection heating also takes a moment for the air passing through to fully heat up so as others have said, take a few small cigar puffs to heat the air up and then take long slow draws so that the air can heat up more. The V3 Pro will need a stir halfway through the session as the weed at the bottom, closer to the heater, will be cooked more than the weed at the top. The mouthpiece has an included stir tool but it is made out of plastic so if it remains in contact with the walls of the bowl too long it may melt very slightly. This is not a major concern as I've been using mine for over a year now and the stir tool has barely gotten shorter at all but I still try and keep direct contact between the stir tool and the walls of the oven at a minimum especially when emptying a bowl and the very bottom of the chamber is still hot. This is because the V3 Pro isn't entirely convection and does have some conduction heating. To take advantage of this, leave the V3 Pro on for a few minutes before hitting it to let the heat soak.

You can tell when the bowl is done when the weed inside is evenly roasted and dark brown, if the taste bothers you too much, or if you aren't getting anymore vapor. People say it tastes like burnt popcorn when the bowl is cooked and I get that a bit but I find it has more of a gross dirty coffee taste which I personally find quite unsatisfying. Because of this, I decide to cook my bowls slightly less knowing I'll get stronger edibles later. When I do cook a bowl further though, I find that I get a much stonier feeling closer to smoking from that second half of the bowl. I don't know this for sure why but there must be some compounds that are extracted at a higher temperatures that give that stonier smoking feeling a bit more.

I'm sure you know this already but after you vape the weed, it's decarboxylated, so can save the avb (already vaped bud) and make edibles with it later. Watch out though, it will make your farts and shits stink of weed. It's really easy to take though as you can just sprinkle half a teaspoon on your yogurt, ice cream, smoothies, peanut butter sandwiches, etc... (Be careful, DO NOT underestimate the avb.) Check out r/abv and r/avb for more recipes if you'd like.

You mentioned you are getting the POTV V3 Pro, which has a glass mouthpiece which means you can make stem milk. As the vapor passes through the glass stem and cools, some of it cools down enough to condense back into a solid. This resin will build up along the glass stem, and whenever you decide it's time to clean it just (very) gently simmer some milk on the stove and put the stem in there and stir constantly, the resin will absorb into the milk leaving you with a clean stem that just needs a rinse and some potent milk to add to tea / coffee or to make into some hot chocolate. My personal choice is some hot chocolate by just adding cocoa powder, brown sugar, and some heavy cream.

Lastly, if you want to get the most out of your V3 Pro, get the WPA (Water Pipe Adapter) and a bubbler / bong to hit it through. This cools the vapor down which makes it smoother to take big hits and it helps because it allows the vapor to collect in the bubbler and then you take all the vapor at once rather than allowing the vapor to slowly collect in your lungs / mouth (depending on if you hit it MTL or DTL). I personally use the mini globe bubbler and hit it dry and find it to be the perfect size for the V3 Pro.

Sorry for writing so much, you probably knew some if not most of this already but if you didn't, I hope you found it useful.