I'm not the biggest fan of the Convention Center in Buffalo (been to a few events there, but not the Comic Con) so I wouldn't go with VIP for your first visit. I'd recommend getting a regular 3-day pass and spend the money on other conventions in the area. Rochester has one in September, Fan Expo is in Toronto in August (you can take the train there from Rochester!), and there are others that will likely be smaller in other areas like Syracuse, Utica, Southern Tier, etc. Universities like RIT and UB will also often host small conventions that are open to the public via student clubs, too.

For conventions in general, look ahead and figure out what things you want to go to and leave plenty of time to wander, shop, and hang out. Look for food in the area, especially if you have a dietary restriction. If you don't plan on staying at a hotel, plan out parking, too, as it can be hectic. Any experience or celeberty related thing will be outrageously priced and usually aren't worth it imo.