1000 calories over maintenance will give you huge size and strength gains, but it will also come along with a lot of fat. Each pound of fat has about 3500 calories and each pound of muscle has less, co if you're eating 1000 calories over maintenance every day you will gain between 15-20lbs in two months. If you're not concerned about gaining fat, go for it. If you want to stay a little leaner, I'd recommend cutting you diet back to about 500 calories above maintenance.

As a complete beginner, fat gain can probably be minimized with a 1000 calorie above maintenance diet if you train really hard and throw in some conditioning work (ie: HIIT) 2-3 times a week.