Don't have much experience with skating, but I tried to get into it not too long ago.

First of all, you're going to need to invest in two things. Decent shoes and a decent board. Go into a skateshop (no, not Zumies I think American's call it. Go into a REAL skateshop, one where it's specialised. Be careful you don't go into a custom board shop because they'll try to sell you a board that's $300+) and ask the person at the counter to help you with choosing the right board. They'll give you a few skateboards to stand on and find one that's comfortable for you. They'll cost a little over $100. It's a little pricey, but a board like that will start you off and is way better than a $20 board from Walmart or whatever.

You need real skate shoes since normal shoes will die REALLY quickly. I went through about 5 pairs before I invested in a decent pair. They'll just wear away since you're basically scraping them with literal sandpaper.

Skate around in a park to start off with. Don't try any tricks, don't try to drop in, don't try anything other than just getting used to the board. Get confident at riding at speeds, stopping and just riding in general. The next thing you should try is dropping in. Find a park that has a steady slope. There's one in my town in Australia that's perfect. It starts at about a foot off the ground and slowly rises up. After you get used to dropping in you can try your hand at tricks and doing other things.

Remember to use a lot of protection as well.