Your budget is $1000.
so basically best bet is to get second hand. At this point of time for your budget, this is my recommendation since i originally used Canon to start out in events.
55-250mm IS and a 50mm F/1.8 is good combo if the 18-200mm is too expensive.
3rd party flash will do if you dont need so much flash controls.
memory cards and batteries.
Thats all you need and if they are used regularly dont even need a dry cabinet.