Hi js:
Don’t worry too much about beans being too old from a micro roaster. I like to believe they more into artisan aesthetics than profit margins. Just contact Trystero and ask them about the roasting schedule and the roasted bean’s preferred rest period. Pretty sure sure they have the profile thing all figured out.
Use the brown bottle to store your coffee… you can actually hear the CO2 gas escaping upon opening a bottle filled with freshly roasted coffee after it was sealed for a couple of days.
I do not know anything about Gaggia. What model do you have? Classic? Go to Youtube, the “Whole Latte Love” channel has a lot of videos on Gaggia.
Go to youtube and find “Seattle Coffee Gear” to learn all about espresso related topics. I just love these two goofy ladies. In here you will find out about topics like temperature surfing, back flushing etc.
If you are still stuck with specific questions, search or ask in “reddit.com/r/coffee”. Btw, what is your coffee grinder?
Enjoy you cuppa!