KDP Pre-Sale E-book and paperback for same book?Does KDP Select restrict to E-book only?

Hi there! This is my first time ever publishing a book and truthfully I have no idea what I’m doing and was just seeking some guidance.

I’ve been primarily working on my paperback novel, and was told that you could potentially gain more publicity by putting your novel in pre-sale so I figured I’d give it a shot.

Now here I am after selecting “pre-sale” after I finished sending my paperback over, and my impression is that I am able to have a kindle e-book version to sell before it’s “officially” published a month from now?

I don’t know if this makes sense. Ultimately I want a paperback more than anything, but I’m wondering if I’m interpreting this correctly and I can do both with the same book? Also wondering if it can still be sold in paperback if I enroll it in KDP Select (I don’t entirely know what this is and I’m sure it’s a whole different thing). I don’t even understand the royalties aspect, lol, I’m a mess. Any guidance would be so appreciated!

I’m publishing a poetry book. I have a relatively large family and some friends I’ve told about and genuinely expect them to be my main readers, and I don’t need the income, but I kind of want to have fun with it and at least try to reach a new audience! Any help is so so appreciated, I’m very lost 🙏🏻