you'll be just fine. this isn't the time of year to have them outside, but you can order some sawdust spawn and increase it inside all winter on
coffee grounds and/or
wood chips or other substrate and then fruit outside once the weather warms up a bit.
consider wine caps (
Stropharia rugosoannulata), too. you can do the same spawn expansion inside until daytime temps are getting near 60 Fahrenheit. I don't know that coffee grounds will work, but
straw and/or wood chips with some dirt mixed in are great. they're great in the garden.