I need like a user friendly setup guide of how should I prepare the splits and etc. It's so confusing to me and I don't know how should I prepare the splits propely, before I'll start my very first run.

Greetings, speedrun community. I'm Sub-Zero and this is my first time registrating in this website of speedrun. I'm a russian and young teenager, gamer interested in classical games from 90s and early 2000s and interested in Single Player games. I'm a rookie artist and trying to master art drawing and at the same time be the legendary YouTuber. Having a good reputation as man of virtue. Although, I'm planning to do my first speedrun and I'm new to the speedrun system. Like how does it work and etc. Please forgive me for my sentences and confusing. My english might be not very good and I'm trying my best to explain.