This website is just brief introduction about our  activity, and where you can find what services provided, despite of this, frequently, we still receive very short enquires as: "hello, I need website", "hi, can you create ecommerce website for me" or "Pls. help. I need a better web page of my company".

These type of emails is not strange a bit, in your request email, you should specify as more details as possible, so that to receive instant quotation. I thought about to put more fields in my contact form, but this might scare potential customers, that's why the form is simple and work for you.

But in your message body you should specify major aspects as:
1. What is your website domain name?
2. Do you have hosting?
3. What kind of website you need, any examples of your favorite websites you like.
4. Design preference - color scheme, layout, structure
5. How many pages to be done?  if ecommerce please specify categories, any  functionality.
6. If your website to be database driven, please specify functions you need to be there.
7. Anything else you want to add.
8. OR do u need a catalog or presentation to be designed for you

So, another word, as rich your email is as easier for us to determine timescale and volume of work.