The first thing that I would do is to contact your local health dept and find out if you can legally do what you have in mind. Some places may turn a blind eye to selling home baked/made items, other's are very strict and will literally come in and shut you down.
In my area, you would never get away with bringing in food that was not prepared in an approved kitchen, prepared by individuals who have food handling certificates.
Our state does not bother with small events to collect state sales tax, especially if it is a once or twice a year event, unless you are talking a substantial amount of tax owed, a few hundred dollars does not get their attention. Nor do I think the IRS would come knocking on your door over that amount, either. But it always is a remote possibility....