Ya know I only really have the best luck with my outdoor grows for auto's but never the less, the best advice I can give is to start them in a big pot. Like really big lol. With a high porosity medium for soil like ProMix (love this stuff). This way the roots have no problem taking off.
Another tip, light on the nutrients. Super light brother man. Start with a good soil and you most likely won't even have to feed much until bloom.
One more thing. Absolutely No HST. None! You'll stunt her.
Hope this helps.