What is the best way I can ensure to buy a house next year?

I’m 21 this year.

I’ve been renting for 2 years, and I’m sick of it. lol.

1750 a month for a 1 bed 1bath. Whereas my sister owns a home in my state, and pays 1250 for a two bedroom, two bath house mortgage.

I make decent money, and am facing a promotion at work for even more money to where right now, I’d have 950 extra to save each month, and if I get the new role, I’d have 1250 to save.

I have 1k in my savings right now. And I literally don’t mind if someone here tells me to save everything I’m willing to.

I want to move out and find a house to buy next year in like November-ish which gives me another year and a few months.

Can anyone please explain how to qualify for certain loans, how much I should save, what I should plan for and anticipate and what credit score I need? (Made some dumb financial decisions that I’m recovering from now and my 3 scores are 590,570, and 601, coming from credit karma)

Thank you!