Hey man! I can help you!
To start off, don't play maps with 24 people. Those maps have lack of pvp space and have too many people.
List of maps:
Ancient (16)
Arcade (12)
Bamboo (20)
Beach (12)
Circuit (12)
Dust (12)
Field (12)
Mushroom (12)
Paris (12)
Party (12)
Ping Pong (12)
Pirates (12)
Pokemon (12)
Snakes (12)
Snowy (12)
Wiring (12)
Zen (12)
Valentines (12) (Seasonal)
Chandelier (12) (Seasonal)
Bunny (12) (Seasonal)
Those are the best maps to start off and play with it, I recommend to play Party, Dust & Wiring a lot! The best maps with Bunny & Chandelier are the best maps if Halloween or Easter is there. You can play the maps but you are risking your death too much!
I play normal chest then i go to mid.
Good start, if you want to win a lot, go to mid and also enchant yes. Most of the time if there are good players in my game I take the anvils & the enchantment table. This makes you really strong so you can get a lot of kills. And sometimes, don't loot all of your chests because it can be time wasting while you have better loot in mid, it's kinda risky but if you play it safe you're fine.
I also want to mention is play as safe as you can! I see a lot of players not even know what they're doing. So if you lose a bit of satuarion, eat a steak and if you ready for an fight, gapple right after. Also, if you lose saturation just eat a lot. Mine cobblestone and make it to cobblestone walls so you can block them. Use water to hold them off. So just place it and pick it up right after. Also, don't go into fights if they have more gear or just knock them off and use your blocks to annoy them and hit them in the void. Just play safe as you can, PvP is also recommended but not the most imporant thing I think. I kill a lot of players that are better in FFA for example and they have no chance against me in Skywars!
I win like 90% of my games with this so I hope this helps you!