Let me try to answer. It is ok to ask anything.

1：你从事房地产经纪多久了，是否全职？
7 year part time.

2：过去一年里，你经手成了多少桩交易？请提供每桩交易的地点，价格，MLS，你代理客人的名字电话供我查询
about 20 per year. Can not provide detail as local MLS rules(Texas is no disclosure state. all transaction detail are private information) as another answer, I need to protect my previous clients.


3：你现在正在代理多少客人，能否每星期带我去看房.
3. No, all appointment need pre-scheduled. My clients (including most first time home buyers) went out 3 to 4 times before sign a contract.

4：如果我自己从网上找到的喜欢的房子，你能否立即帮我联系看房

Usually yes, need 24 hour notice.
5：能否一开始不签合同，让经纪先找几栋房子，看看双方的品位是否一致

No. I have all client sign agreeement to protect me. But my contract can be canced with 5 day notice.

Above question s does not help you to select a good agent.

Let me give you some suggestion.

1. ask the agent is a real estate investor. What are the performence.
2. ask how to work with clients. Do he/her provide marketing analysis.
3. If you do most work by yourself, ask he/her give rebate/credit.

Remember that you are the boss to hire an person work for you. You like to hire an very experienced agent.