I've been doing it for around 3 months now and here's a few basic things I've learned.
Tap early, tap often. Once you have a lot of escapes in your game you can fight submissions but just starting out try to not end up in submissions, if you get there tap and reset.
When your on top you want to take space away. Bottom you want to create space.
Postition over submission. It can be exciting to finally lock something up but give it up if you feel like youre about to get swept or end up in a bad spot.
That's all I know so far. If I said anything wrong feel free to correct me. Congratulations on starting, like I said I've been at it for a few months and its improved my confidence and completely changed my way of thinking.
Good things you've absorbed.
One thing I'd say regarding position over submission...and it'll make more sense as time goes on.
It's true. But I tell my students that good submissions are really just positions that can make someone tap out. So if you view everything as a position, sometimes it makes the game easier. Especially without the gi, being able to use submissions as grips or positions is so useful, even if you don't get the tap. The kimura grip and the guillotine or the darce are great examples of this. The kimura is used as a grip to sweep, pass, take the back, or to transition to an armbar or inverted triangle way more than it's used to actually tap someone out with the 'classic kimura finish.' The value is in the grip. If you can get the tap with it, then that's great too. But it opens the elbow from the body (weakening the other person massively) and it isolates an entire corner of their body, and allows you to move independently of them without them being able to really adjust or chase you. It's maybe the most powerful grip in all of jiu-jitsu, and I use it all the time, but I rarely actually finish the submission hold itself. And this applies for a lot of techniques.
Omoplata is another one that comes to mind. It rarely gets the tap but it's basically a guaranteed sweep if you get the position, and it opens them up to other submissons as well.
And this whole heel hook craze. Even if you don't like leg locks, they're great tools to sweep or to pass the guard. Points and the fact that most tournaments don't give points for submission attempts IMO are part of why people view submission and position as two different things, but the best submissions are solid positions as well that just have the benefit of being able to make the other person tap.
And oddly enough, sometimes submission before position is good too. You're taking the back, right? The best time to get the choke is as you're taking the back. They defend the 2nd hook, often with their hands, because they don't wanna get their back taken, and you sink the choke in the transition. Once you're fully on the back, and you settle in, they've got their defense in place and then you've got to do your hand-fighting sequences and what not to finish. Same with getting the darce or the guillotine as they turn in to defend the guard pass. You start a pass and threaten a choke, and they have to defend two things at once, and you can usually get at least one, if not both. These examples are very evident if you watch these submission only matches that are popular now. There aren't many finishes from the back unless it's overtime in EBI (where you get to start there) because when you're taking the back, they aren't worried about getting scored on, so they just defend the choke from the jump, and it's way harder to finish. And if you're passing the guard in sub only, people won't really turn in, so you see less of you darces, guillotines, and far side armbars or arm triangles off the guard pass attempts.
Watch the G.O.A.T. Marcelo Garcia, debuting at ADCC 2003. He arm drags to the back and he's on the neck with the rear naked choke before securing hooks, and he said after that against Shaolin (who was the king at the time) he never would've gotten the choke if he'd fully secured the position first.
I'm starting to ramble. Some of that submission before position stuff applies more to no-gi than gi. I hope this helps and wasn't confusing. I'll talk about jiu-jitsu all day.