Me and a rather large group of friends got into tabletop RPGs last year (well, to make a long story short a few of us did at first then we added more people as it went on) and it's been a blast. DMing, especially as someone with very little tabletop rpg experience beforehand, was intimidating but it's become one of my favorite hobbies now. I love it. Currently swapped the DM position with someone else so I could try out playing for a bit and he could try out DMing.
Some general tips and stuff:
1: Don't be worried about playing everything exactly by the rules and doing everything right, especially if nobody there is very familiar with them.The rules are there for a reason and generally should be followed as best as possible, but if something is more funny/dramatic/entertaining and kinda bends the rules a little, allow it. The rules are a structure and tools that help ground and guide the story, but they shouldn't overwhelm and restrict it if it's preventing enjoyment or fun.
2: Don't plan too much. If you're making your own campaign, make a few ideas you really wanna do, like maybe a location, some plot hooks, characters, etc, but leave big chunks of things undefined and unplanned so that you and the players can make and establish them together. There's a balancing act to this that is really hard until you get a feel for it, and for your first time or two you're probably going to find that you either planned too little (the players will do something and you may find it hard to improvise something) or too much (making a bunch of stuff the party won't end up seeing because they wanted to go somewhere different/do something else) and you'll get better at it as you go.
3: HAVE FUN. No, seriously, above all else your job as a DM is to make sure everyone is having a good time. Sometimes this can be hard with things like inter-party conflict, but if you do your best to make sure everyone is invested and having a good time with their character, even through bad situations for them, you're doing a good job.
There's a lot of resources out there online for people in your position, btw. The RPG community is one of the most welcoming and kindhearted I've seen. I've kinda started to loathe reddit but I'm continually impressed by how awesome and helpful the people over at r/rpg and r/dnd are. There's a lot of YouTube videos on DMing and good practice, tips, etc. Matt Mercer, who you probably know as a game voice actor, has a pretty awesome
playlist of such videos you should probably check out.