Same as everywhere I guess. Or... what specifically you want to know? Try to lurk CFTC guides, hope they will help
Agreed, you're paying double commission to do the same thing as closing your position would accomplish.
Hedging - most brokers suggest opening 2 accounts, one for buy the other for sells which disrupts margin, also FIFO rules. hedhing is nonsensical ... not when it works. I used a sophisticated hedging technique, actually works quite well.