Greetings Ye Who Hold the Knowledge…
As a total newbe to administration… some questions if I may…"welcome, get some coffee, some tylenol, some whiskey, a couple of new monitors, and a comfortable chair"
Should I be performing some type of daily/weekly/monthly maintenance on my site? " ha ha ha, why hell no, dolphin runs itself, you just sit back and collect the money as it rolls in by the truck load" (sarcasm), dolphin is a beast, and you will need to treat this thing as if you have captured something from the wild and brought it into your house. the only difference here is that dolphin is the beast that gets in your head, and will drive you absolutely insane"
What/when/why about empting the catche/s? "seems there is no rhyme or reason to having to clear the cache, kinda like when driving down the road, and a fat bug splatters on the windshield, no rhyme or reason as to why it hit your car, you just automatically, turn on the wipers and give a squirt of fluid, similarly, when something dont work right on dolphin clear the cache. if you dont have anything else to do, clear the cache, if your ol lady pissed you off, girlfriend is cheating on you, kids not listening, clear the cache"
Is there anything that I must attend to or watch for, so I don’t get charged extra by my hosting company? " well this is a trick question, since we dont know where you are hosting at, typically if you get on shared, and it is one of the donned premier hosting providers here, you can rest assured that you will be notified in a short period of time, that you are consuming too many resources of one kind or another, and your site will most likely be suspended, and you will be requested to upgrade."
Do you know which html file has the line “Welcome to the Community” in it? " none" , it appears to be a lang key
When I correct or change thing live online with Firebug, it doesn’t stay changed… is that how it’s supposed to be or I’m I missing something? " yes that is missing something, you only make changes on firebug as a preview, you would still need to edit the files on the server. firebug only provides a preview of what the changes would look like if you were to edit the files"
Anything that you think might help me better admin my Dolphin community would be much appreciated! " see item 1"
Thanks… 
At your service,
GB