I'd start with F5 and Rootbeer Float as soon as they come to room temperature. I'd take the tops and nipples off of the other bottles to let them air out overnight in a dark place. After that, put the bottles back together and let them sit for a couple of days then I'd start trying them out. Custard's Last Stand, Creme Brulee & Frenilla all get better as they age (tightly capped) in the dark but are still great after a week or so of aging. Many people like Grandma's Cinnamon Danish fresh but if the cinnamon seems a little strong to you just let it rest until it gets sweeter and milder.
It mostly comes down to preference but most people agree that bakery flavors are worth waiting around for. I 100% agree with this approach with one exception... if it is your first time ordering these just vape whatever you like and order more of whichever ones you know you want to keep on hand. That way you'll have your favorite flavors already steeping before you completely run out. Vape on sister!