First of all, welcome to the convention I was just like you a few years ago, the con will offer early badge pick up watch for the announcements, I would try to pick up you badge early, tip go an hour before the early badge pick up wait on line trust me you be glad you did.
Also for first time tips pack your patience, especially of your looking for photos with the VIP guest and or autographs line will be long and watch for any changes in the times.
If your going to attend any sessions the popular ones will have long lines to get in, again be patient.
Food wise there are some offerings at the convention center but plenty outside the convention center.
Plenty to do at the inner Harbor too and they will be baseball games.
People that attend this con are 1000% awesome never had a problem with anyone.
The con staff, operations, medical etc etc are excellent just pay attention what there saying even if its
not what you want to hear, they will guide you in the right direction.
Just be careful at night, last year I seen an increase in the homeless they can be a pain
in the ass begging of money.
Water Water Water guy is harmless, you can buy his water for a dollar, dollar, dollar,
Most of all have fun, monitor this sink hole situation it is going to directly affect the
convention center's foot traffic and the light rail.
All the best for a great con.