Personally I wouldn't bother with the light... Bottles are expensive enough and I've yet to tan any one with light. I use light on myself as no one ever asks for it so im just trying to get rid of it TBH. If you feel you're client base may use light then go for it.
Id advise two medium bottles and one dark. Anti aging tans were more expensive than the normal ones if I remember.. Again the bottles are expensive enough as it is and you'd probs have to charge a bit extra for the anti aging. If you're mobile tanning no one expects to be offered anti aging so i suppose its not essential.
Some people like the choice of extra dark but im not sure VB offer this?
Not a problem! find me on instagram @ ais.bronze if you ever want to send me a PM.
I actually now use lusso tan.. Its a little less expensive than VB. Great colour, no smell and dries fast. I think its a pretty good rival for VB. It has light, medium, dark and ultra dark.
Theres some amazing tans out there that are reasonable for price if you are just starting out again. Send some emails to brands and trial as many samples as you can.. I dont have it but crazy angel guilded mistress was one i got a sample of and loved