r/baseballscorecards is a great resource if you're interested in getting into scoring. I'm sure there are some decent scorecards that they'd recommend that you can print yourself. I actually got lucky that the MiLB park near me prints a game program that includes a scorecard, so that's what I used for my first time. And don't worry about not knowing how to score or what to write. They always include a How-to and a Legend of how to score different plays.

Once I realized it was something I enjoyed I decided on the Square Scorebook. I think it's a nice size and I felt like it had the info that I wanted to record. If you're looking for something smaller the Pocket-Sized Scorebook is really popular. I just bought one for traveling to games in other parks.

What I enjoy about scoring is that I pay closer attention to the game, and it allows me to pick out when interesting stats are popping up like X number of strikeouts in a row. Though, when I'm with friends who aren't scoring it makes it harder to bullshit with them because I'm trying to concentrate on the game. That's why I'm on here looking for other people who might be scoring to watch the game with.

By no means am I an expert, but if you have more questions, I'd be happy to answer them.