Start by looking around and asking: why is there something instead of nothing? how did the universe come about?
God created and sustains all life
I agree with that but i meant more on the practical side? I guess reading the bible and attending mass could be something but yeah
You can study comparative religion and realize that Christianity makes sense not only on tenets of faith, but its seed is martyrdom. Not only the Apostles, but thousands upon thousands of Christians were martyred for their faith for 300 years after Jesus' resurrection. No other religion can claim that
What is your religious background?
In any case, I recommend praying (this is key!), attending Mass (without receiving Holy Communion - at least until you convert), and reading the New Testament (especially the Gospels) as well as the excellent *Catholicism for Dummies*.
Im Agnostic but pretty open to religion. I have found that a lot Catholic Requirements how to behave do probably lead to a better life than some of the modern stuff. Am pretty liberal tho in general but wanna lead a happy life of less sin and i think God could be the way. Have sinned a lot already and it brings nothing but sadness and despair.
Well, that's one of the wonderful things about God - He's infinitely merciful, and in forgiving you of your sins, He destroys them, and it is as if it never happened in His eyes.
Starting with Catholicism is Bible and Mass.
Listen to the Bible In A Year Podcast. You can find it on YouTube, and numerous Podcast apps, such as Spotify, Google / Apple Podcasts, etc... Attend Mass every Sunday, at minimum. Also ask your priest at said parish about an RCIA class.
Attending RCIA does NOT mean you WILL become Catholic. It is there to say that you show interest. I've heard a lot of stories about people who had attended RCIA 2-3 times over 5-10 years before finally accepting to get baptized and / or confirmed.
I'd also suggest a daily Rosary.
Perhaps not much more than that, for the start. You don't want to get too far ahead of yourself.