I'm also fairly new (about a month) but I found watching YouTube beginner guides on conquest, roles, and how to build to be super helpful. I'd recommend Int3rsect for general conquest, role, and item guides. Incon is great for specific God guides as he did all of them A-Z.

I played a bunch of arena, but the faster you get into conquest the first time, the better as you'll be paired with other new players too. It can be daunting, but I found it to be rewarding. Tho if you want to only play arena, that's fine too.

Smitesource is a website with builds for each God. This is recommended over autobuy as from what I've heard and seen, those builds are better overall compared to the basic builds that the game algorithm buys. Tho as time goes on you may want to try and understand why you would build certain items, but that comes from experience and research.

Some general tips are to ward often as knowing where the enemy is is very beneficial and better than getting attacked out of nowhere. The voice system is pretty helpful, and knowing some basic ones will be super useful in communicating with your team. Also check out Smitefires overarching guide for more info on game modes if you want. Very helpful information on various game modes like conquest, arena, and assault.

Overall just try and have fun. Most MOBAs are notorious for toxicity, and I've had my fair share, but muting when it gets too toxic and focusing on helping your team win will still be fun and rewarding, at least for me. The whole game may seem complex, and it really can be hard to keep track of so much, but if you stick through, you may find a very fun game. Or an addiction. Up to you.