This will be my first con as well so I'll give you tips I got from Anime Insider, Drama Con, and random people.
Dealers Room
Dealers rooms are normaly crowded so leave big bags and props in your room or with a friend.
Compare prices, if you see something you want look around and see if other tables have it cheaper.
Look at everything, don't blow all your money at the first table you see.
Before you buy it think if you realy want it!
Bring cash not all dealers take credit cards.
Be Organized
If you are going with friends decide who is bringing what.
Pack neatly
Decide ahead of time when and what you want to see, and when you should eat sleep and shower, if you write it all down you will be less likely to miss them.
Bring a cell phone and/or a watch!
Bring your own food and LOTS OF WATER! carrying a small bag of veggies or trail mix is great for snacking on the go.
Most places have maps of the hotel at the front desk, take one cuz you never know when you could get lost.
Cosplay Emergency Kit
It's always great to bring a small sewing kit, just pack a needle, some buttons, safty pins, bobby pins, thread, small scissors and super glue. Also bandaids would be a good idea.
THE TEN CON-MANDMENTS 1. Thou shalt observe excellent hygiene even if thou normally dost not.
2. Thou shalt keep it the hell down in the hotel hallway. Everyone else wants to sleep, and some are more than willing to beat thou up.
3. Thou shalt not fight over the last Kyo purse.
4. Thou shalt ask before glomping.
5. Thou shalt not be offended when locals whistle at thy Felicica out-fit. Thou chose to walk down main street in it.
6. Thou shalt not wear gaiant costumes in the packed dealer's room.
7. Thou shalt not discuss personal subjects at a loud volume unless thou wantest everyone to talk about it on the Internet.
8. Thou shalt keep thy Yaoi Paddle to thyself. (Unless asked, and then thou mayest wield it freely.)
9. Thou shalt not embarrass thyself in front of the voice actors. Especially thou shalt not present them with thy saucy fanart.
10. Thou shalt have an awesome time!!Well thats it
If you see me make sure to say hi! I will be dressed as Sailor moon!