Welcome to the addictive world of hill walking.
Bennachie is a great wee hill and one I get to se alot on my drive to work. Morven might be a good one to add to list as it has great views of Lochnagar and Mount Keen.
Kit wise you don;t have to go all out but breethable waterproofs are essential, and try to stay away from cotton t-shirts and jeans as these hold water anf can get cold/uncomfortable. Beyond that enjoy the challenge of your first steps and you'll soon be looking for bigger (but not always better) things!!!
