2)playing against computer doing whatever until I could 1v3 them
3)noob pub games
4)finally ladder, mostly 2 base production focus though, rather than 1 base builds
So I'd rather recommend 3 hatch hydra plays and so on for beginners, than 5pool.
Not worrying about specific builds much, simply working on mechanics and trying to have a lot of stuff.
Hell, I was doing a lot of 3 hatch lair -> hydra/queens(for broodling on HTs) when I first started playing on PGT, and it was obviously a horrible build, but it still got plenty wins to progress. Eventually hitting a wall that could not be overcome with execution, learning proper builds, etc.
Just remember to have fun. Order of importance is pretty much: having fun -> mechanics -> builds and adjustments -> tactics.