How to evaluate a project?

Question

Work organization

Probably a stupid question, but maybe I'm missing something. They ask to evaluate the project and asks PM.
Below is all the information

Required stack: Laravel/Vue.js
Brief project description: The project consists of developing a fully responsive web site where the customers will have the possibility to create their own, wedding invitations, business brochure cards, etc. Additionally the customers will be able to buy already developed brochures and to sell their own creations.

In my opinion, according to this information, it is impossible to give any assessment at all, even the roughest one. I would like to know if I don’t understand something, or do PMs with a client have no idea what web-development is?
PS: Estimated means how long the development will take.

Answer 1

A common practice in today's development world. The calculation is simple, you now name the cost without going into details, since you don’t know them, they start working with you, of course, in the process of work, additional work arises for which no one will pay, since you agreed on the price initially. That is, all problems fall on your shoulders. Look at each freelancing task for the same situation, first evaluate then the TK will be
One solution. Or hourly pay or let them give you an extended TOR, otherwise my advice is not to work with such a customer

Answer 2

Without a clear TK - an assessment of HZ.

Answer 3

PM with a client have no idea what web-development is?

Yes.

How to evaluate a project?

Quantum in three months. Or six, as you like. And don't forget to multiply by π for realistic timing...

Answer 4

Decompose tasks, compose and refine technical specifications.

Answer 5