Generally, no. The realtor must honor the terms of the first contract. A legally binding contract is enforceable in court.
I will sign it with my full name after throughly reading the contract.
A Listing Agreement is what is normally signed. It is a contract, so read it carefully. It defines the payments to the realitor and the length of time.
Call the realtor and notify him/her that you have decided not to sell. Then follow this up with something in writing. Depending on the terms of your contract, there may be damages for breach. You'd have to read you contract to find out.
The time limit a seller has to sign a real estate contract will be part of the contract the buyer writes with his agent. Typically a buyer will get a recommendation from his Realtor what is customary in the local market. This can vary from giving the seller just a few hours, up to several days or more.
No. It sounds like your realtor is a weasel. I'd report him/her to your state real estate commission.
Your realtor will have his/her percentage of earnings on the sale in your contract.
If you didn't sign the contract then you are not bound by the terms. You can't be sued for breaching a contract you didn't sign unless you authorized someone else to sign on your behalf such as an attorney-in-fact or authorized agent.
That you signed means that you agreed to the contract. People who were illiterate would consummate a contract with an X. Often, they would need to have a literate witness sign but, the mark sealed the contract.
There are four kinds of Realtor Logos. This will explain the most complex. Included in the Logo should be the R with trademark that represents one is a Realtor, the name of the Realtor, the firm name for which the Realtor works, any social media the Realtor is connected with, and whether or not the Realtor is in connected to or with any elections.
No. This is forging a signature and is illegal.
No. No one is responsible for a contract they didn't sign.