Try not to sound too paranoid of him. What if it is a really good job and he just forgot to mention things about the company? You do not want to seem overly suspicious, it may hurt your chances of getting the job.
I would also not ask about pay or benefits in the first email to him. At least in the U.S. this is typically done after they assess your skills.
I would send him your resume but perhaps take off your phone number and address until you hear more.
This is what I would send, but it is only my opinion:
I received your message from David. I am excited to hear more about this opportunity. I have attached my resume.
Can you please send me some information about your company and the job description and a way to contact you?
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