Hi, Sophia. I can give you 3 pieces of advice from my personal experiences.
1. Don’t Rush.
Never “rush” into the invention marketing process. Make sure to take your time before making important decisions that affect you and your invention. Rarely are there situations where an inventor needs to make a decision within a few days.
Thoroughly investigate any invention promotion company BEFORE providing them with your invention or money. You can visit the FTC web site to search for information about invention marketing companies.
Educate yourself about the invention process and invention marketing companies. The Federal Trade Commission (FTC) and the United States Patent & Trademark Office (USPTO) have several informative articles for inventors to read prior to starting the invention process.
in the end, I wish you the best of luck for your invention.