New 2 BFa (trouble gearing)

Hey guys looking for a little guidance. I’m new to BFA I’ve played on and off over the years. Made a return during the pandemic and started a lock. He’s currently 120 with a 451 ilvl. I’m feeling either overwhelmed or lost in the sauce. I want to gear more for PvP but it seems everywhere I look is 445 loot or lower. I also having trouble running mythic because people don’t like my ilvl. Where can I go from here? How do people get 475 ilvls or higher? Thank you.