>>2066835The classic entry point is a “starter set” with an oval of track, locomotive, a few cars and a controller. If you’re interested in Japan, a Kato N scale starter set is a good pick. Their track and locomotives are very reliable. I’m all about cheapness and making do but it could be a big turnoff for a beginner to get frustrated with cheap crap that doesn’t run.
From there you just keep buying more stuff and learn skills. Is there a brick and mortar hobby shop near you? A club? You’ll encounter some crusty old boomers but some might be cool and may give you a deal. Train shows are another good place to buy and learn—a big hall filled with vendors and portable layouts. At the end of the day vendors are willing to cut deals as they’d rather not load it back in the van for the next show.
Are you in the UK, or where? That has some bearing on brands and terminology.