Id start with geese in the spring, do the leg work and scout. find where the birds are roosting and where they are feeding. if you can get to/get permission for where they are feeding all you have to do is be well hidden when they come to eat and you'll be able to kill birds with out calling or dekes. However having some decoys out and knowing how and when to call will greatly improve your chances.
Id recommend picking up a cheap goose call to start practicing right away, so you feel confident on your abilities by your opener. Something like the Zinc power clucker is a great sounding call for under $40. Also look into an instructional dvd to get some pointers, this will greatly speed up your learning time and reduce any bad habits one might develop.
Id start with goose decoys, as ive killed many ducks over an all goose spread. However goose dekes are EXPENCIVE so what style, brand, and quantity are really dictated by your budget. I started with goose shells, they have the best price per bird ratio plus you can add foam inserts inside them and use them as floaters. Also silhouette decoys are a good choice as they are a cost effective way to add numbers and a little motion to your spread, plus they are light to carry and you can make them yourself out of corplast and paint. I would recommend using full bodies if you can afford them, the realizim and motion cant be beat. However they are bulky and heavy. But please do yourself a favour if you decide to go this route and buy some good quality decoys like Avian X because they will get beat to ####... the cheaper they are the faster this happens.