:-)
1) you shouldn't have a problem with a virus, if you keep avast updated, The shield always on, and follow basic precautions when surfing & using your PC at all.
2) go to all of them;
the more you know, the better you can decide, what to do..
3) first check the DB & homepage of your AV-prog (i.e. Avast)
4) vgrep (above) lists the different names used by AV-Progs for the same virus. so that's the next step;
Some very new or rare stuff might not be listed there; then I go to Trendmicro or McAfee, because their DBs list lots of aliases, and mostly a removal procedure.
5) google
6) On a virus find, I always check the alert with another scanner.