With such a topic so broad we truly try to cover the basics from all angles in this group. Nothing too big or too small. Nutrition is as significant if not more as exercise is to reaching your goals so learn all you can.
Hey there... I could recommend only one thing, and that is to change your goals. Losing 30lbs in 30 days is unrealistic and could be very unhealthy and dangerous! If you do manage to lose a lot of weight very quickly like this, you will likely put it on soon after.
I would aim for something more like 1-2lbs per week, and even that takes a lot dedication. What happens in 30 days that is so important? Diet planning is not a 30-day thing, it's a lifestyle change, and your goals should really be to be healthy in the years to come.