What is the best way to get better at this game? Just keep playing bots till I get comfortable?
Play the game a lot.
When you aren't playing the game, read about the game.
Random a hero against human opponents.
Fail horribly.
Go read about the hero you failed with and learn about how they're supposed to be played and try again.
Do better than the last time you played that hero.
Don't be afraid of failing. You're going to be a calamity magnet for your first year or so of playing. Probably longer.
If you have the drive to actually learn and get better you just will over time.
Avoid bot games at all costs. Going 0-30 against human players will give you vastly more knowledge about how Dota actually works than any amount of time spent playing bots.
If you've just recently started playing Dota, save your first couple of replays against human opponents. You'll be glad you did. I regret not downloading my first few games and I really wish I could go back to seeing how awful I was. Using WASD camera and having no clue how to execute basic game functions.