re: "Where can I get a detailed flow of activities after I submit a proposal?"
Upwork does not provide a detailed flow of activities.
If you submit a proposal, then you are done. That's it. There are no more activities.
If a client sees your proposal and your profile and likes what she sees, then she will contact you and talk to about the job. If she decides to hire you, she will send you an official contract offer. You will need to click a green button to accept the job. If the job appears on your "My Jobs" page, then you have been hired.
Until you have been hired, it's all just talk. Until then, you should not do any work.
AFTER you have been hired, only your client will instruct you as to what needs to be done. Upwork will never tell you what to do for your job. The job is between the client and you.