Try the shroomery. I think its shroomery.org or something. They have forums and a large faq about shroom growing.

You can buy a spore syringe online easily, they have a bunch of vendors advertising on the shroomery. You can easily make one with a sporeprint, a syringe, and some sterile water, by just combining it in a clean bowl(preferably sterile and sucjking it into the syringe. If you boil the water to make it sterile, make sure it has fully cooled before adding the spores.

You might be able to grow by putting it ouside somewhere, but you will get much better results froma controlled indoor grow. All you really need is some rye grain, or compost, or whatever grow medium you choose from researching at the shroomery, a container, and maybe a few otehr things, since you already have the spores