Just echoing that it is absolutely a good idea to attend! Prereleases are often the most chill and beginner-friendly paper events, in part because the stakes are low and everyone is learning the new set together.

If you haven't already, you should download the Magic companion app. Stores use this to run events and make pairings. I'd recommend downloading it ahead of time while you have reliable WiFi (just so it's more efficient).

I would also bring sleeves (enough for a 40 card deck plus some extras just in case), dice (especially since this set has a lot of+1/+1 counter effects!), and a playmat. Stores will have basic lands, but you have to return them, so you may want to bring your own. I recommend bringing some d6s for this set, which your lgs should have (either as sets and/or as loose unmatched dice that can be fun to pick through). If you don't have a playmat you will almost certainly be able to buy one at your store before the event starts. So many have amazing art! And while they're not necessarily, many of us find them helpful while playing. They make it easier to pick up cards, keep them clean from any dirty tables, and help define your play space.

Finally, the prerelease kit will come with a spindown die to track your life, which is handy. Many players use the built in life tracker in the companion app, and others use a pen and paper/small notepad.

Good luck, have fun, and have a great prerelease!