Congratulations from me too and a tip what to do about that dust. I ride all the time on dusty Rail to Trails. Someone more experienced told me to do this and it has kept me out of trouble for many years:
Use a cheap paper towel (blue ones from Walmart) and spray a liberal amount of WD-40 on the chain and towel. Keep pulling the chain through the towel until you feel that it is OK. (It is not critical how much)
Next, use a clean towel and apply a small amount of chain lubricant to the chain, distribute it with the towel and wipe excess off.
Do this almost every trip and you should have no trouble.
You should have seen my bike today after a downpour. It is a mess. I use the above method and go again tomorrow.