You wrote this well, Adam! Here are a few pointers:
I'm trying to write a proposal. [That's a sentence. It needs a period, with no space between the last word and the period. The ONLY punctuation mark that has a space after the word before it is the first quotation mark of a quote: She said "Yes."] Please correct me. [Again, the period goes here.] .
Following our discussion, [Commas go after dependent clauses that start sentences. But because the clause is short and there's no confusion about your meaning, the comma here is optional.] I am ready to offer my services for the completion of your project.
The services consist [It was plural in the first sentence, and you name more than one below, so stay with it.] of making:
- The visual identity, including the color scheme, logo, brochure.
- A responsive website. [A period here is optional, but because your first bullet point ended with a period, you need to be consistent.]
- A web application to manage the registration of Congress. [I don't understand this line. Do you mean registration for a congress?]
Depending [Unless this is a text message, your sentence MUST start with a capital!] on the details you provide us, my [Or a or the. Otherwise, you're not talking about a particular design, you're just talking about design as a broad concept or topic.] design will be at your disposal.
Student or Learner