Hi Hauff, and welcome to Pet Talk!
Everyone and their veterinarian will have different advice for feeding. If your puppy is staying indoors during the day, I think I would spread the feedings out to three per day, so that you can. When my dogs were puppies, my vet instructed me to leave the food out for them, but they were outdoors all day, so the "mess" wasn't an issue. You just have to work out a system that fits your schedule.
And my only advice on the discipline issue is to keep your eyes on your puppy when you allow it free roaming of the house. Puppies are so inquisitive and get into trouble when left alone. Its not their fault, just their nature. Correct him when you see him do something inappropriate, but don't scare him. And praise, praise, praise when he does the right thing! He'll learn that its better to do the right thing. I think voice corrections are much better than "hands on" corrections. You don't want to frighten him, just let him know what is right and what is wrong. I used a "leave it" command quite often, and must admit, that I still have to do it occasionally! And my dogs are both about 3 years old!!!

Anyway, I'm so glad you're here. I know you will love it!!

Logan, Honey and Lilly