There is NO reason to feel the need to disclose such personal information right outta the gate, You might be on date 3 and decide this person smells has horrible table manners etc and is not someone you want to spend anymore time with.

When asked what you do tell them you are in _____ filed. Certainly if pressed for say location or employer .. say something like.. Wow your asking alot of personal questions that I am not comfortable answering at this stage, and direct the conversation onto something else.

Don't ever feel pressured to give out more informations than you are comfortable with..

Good luck and enjoy yourself