A good tips for goalie:-

Always be aware on the player that you are not concentrating when you are looking at the ball. They are the one who can make the difference.

Think ahead of the opponent. Look for any chances that he can do, and try to cover it.

Always pressure your opponent, in such as rushing out, punching the ball or etc but stay calm and concentrated.

Keep interaction with your back 4.

Last but not least, practise make perfect.

As for me, I'm one of the rare keeper who preferred to play with bare foot and without any glove. In field or in futsal, it doesn't makes matter for me as long I know that I can perform and do my job.

well..1 good way was keep on shouting at them during match if they wander too far.
I used to watch my goalie idol, the great dane peter schmeichel play and learn a lot from him
his on field communication with defender is one of the best
you can keep on watching him interacting with the back 4

bout playing with or without any boots and gloves, i say it is on the keeper choice.
for me, I still trust my bare palm rather than glove(after few experiment).
it's about comfort and while bare foot might cause much higher injury(malaysian field ), I feel weird wearing a pair of boots.