welcome to WG! Singles PvP is honestly very brutal to learn as a new player and, if I'm being entirely honest, the pvp world is almost entirely mains based now so definitely focus on getting the combat levels up! It may seem like a long way off but there's a great guide by one of our members on a board for members only which you can use to afk train so honestly you'll be up to good levels in no time if you wanted to be.
In terms of learning pvp, we are mainly a multi clan and I'm really an advocate for learning multi first. Our pvp staff team are awesome at keeping the trips inclusive for those who are new - so long as you listen you'll get on great and pick it up in no time. The only way to really learn singles is to learn the mechanics, multi is nowhere near as mechanically challenging but you can still learn the basics from it! Once you have got them down, lms, pvp arena or even practice 1v1s is the way to go for learning singles.