Advice Needed Request from a newb

Hello there! I'm new to this forum, and with the thread, I want to ask for help/start a discussion.

Here's the thing. I'm selling anime/games t-shirts and different action figures on social media. Quite recently I decided to get a website, I heard somewhere that anyone could develop anything on WordPress and failed terribly in addition to the fact that someone said about internal seo, that I don't understand. If you can or know someone who can fix everything or do it from scratch, please recommend it.