No you can use up to five traps here complete box with 3 escape rings. check out the FWC site under salt water fishing regs. As far as the rings and simaler items they work great.
Chicken backs necks etc all work good. I use zipties to secure the chicken.
Pick any bridge or dock/pier give it a go for a few hours and see how it goes if not change it up to a new location. also take a bucket or something to put your crabs in. Limit is 10 gals aday per person per day. from land. here is the link
http://myfwc.com/RULESANDREGS/Saltwater_Regulations_recbluecrab.htm . Have fun we have 5 cups or so in the frezer for a up coming get togeather .