Its easy to get stuck on a rare card's theme or ability when building for limited formats (Prerelease/Draft/Sealed). Base your deck build on uncommons that share a theme and use the rares to supliment that instead of trying to build around one rare card. Once I started doing that my decks played better and didnt stall out if I couldn't draw the one rare card during a game.

I would focus on having fun and making sure you stay within a cohesive theme instead of building around a single card or two.

It helps to familiarize yourself with the color archetypes for the set and the mechanics.

If you want an indepth guide to the set and draft sim check out this site

https://draftsim.com/mtg-lord-of-the-rings/

If you're into podcasts, listening to some of the limited-focused MTG ones could help you. Lords of Limited or Limited Resources are good starting points. Here's LoL's primer on the LotR set: https://www.lordsoflimited.com/episodes/ltr-crash-course-episode-326