Welcome!
Going to a tournament is certainly a great motivator to paint an army. I did the same last year. Painted up 1500 pts plus extras in four months. Certainly not the highest painting standard in the world but had a cohesive look and I was quite pleased with having a fully painted army on the table. Take a look at my army blog here: I like Big Hats and I cannot lie [2022-05-01]
As for playing in 6th edition, it’s not a system I’ve played in decades. You are going to use the Ravening Hordes list I presume?