Will travel to Nice from Oct 26 - 30

Hi, everyone. It's the first time I travel to Nice. I am from China. Please kindly give me some recommendation and suggestion :)

I will stay in Nice on Sunday.
Monday: St Paul-de-Vence
Tuesday: Vence
Wednesday: Antibes
Then, will take the train to Portofino on Thursday

Have some question:
1. Is St Paul-de-Vence and Vence totally same place?
2. Is there any website then I can check the bus schedule for TICKET AZUR?
3. Is there any special market on weekend?
4. Is there any second hand or antique store in Nice?
5. Is there any upcoming events that I can join to learn more about France?

Any information is welcome and very appricate your help :)