Those look like class-B spores. Shroomery.org screens there advertisers to pay attention to the banners. Get directions from shroomery.org, a search engine will rank the good ones up top for you. I think the easiest thing to do is buy a syringe with BTC (about $30) from one source. Next, to get started, get some rice or corn prepared Mushroom Substrate Jars from ebay (also steril). In the future, you will have these jars (correct size and shape) and a pressure cooker so you can just just reload them with organic corn and re-purchase another sterile syringe. Look for direction on shroomery on how to Inoculate the jars in a oven with the door open.

This is probably the least amount of work you can do. It takes probably 3 months to grow them. You should have a food dehydrator handy and put the temp on the lowest setting. This may leave you with 6 months to a year's worth.

Overall this should be a reasonably safe approach. You're not leaving much of a paper trail by using BTC to purchase the spores. Buying spores means you don't need a clean vent hood or room. Once you get the jars you don't need to keep buying them from ebay if you find a good method to re-cook the substrate in the jars (pressure cooker, etc) leaving them steril inside. It is actually very easy and a great way to practice patients.