The vikings were not a single entity. A viking was simply a trader/raider. They could have belonged to any Scandinavian country. From Iceland to Sweden and anywhere in between.
So, they were not led by any one person. They weren't an army of any sort. Just traders who sometimes raided the easy targets.
Also bear in mind, not everyone who lived during the viking age was a viking. They were mostly farmers.
However, to answer the question, the "leader" of the Vikings in 1000 on the voyage to Greenland was "Eric the Red". On the voyage to North America, it was "led" by "Leif Ericson".
Leif Ericson
That was Lief Erikson
Hungary
They began in 795 They ende in 1000
Somewhere between 800-1000
Leif Ericson
who commanded the Viking expedition that supposedly reached north America
Possibly Leif Ericsson
England
That was Lief Erikson
Hungary
The proper noun is Leif Ericson (Anglicized name of a Viking explorer, circa 1000 AD).
They began in 795 They ende in 1000
Erik the red. his son leif erikson discovered America
Somewhere between 800-1000
Whatever personal weapons the crew members used. The era of the Viking long boats (around 1000 AD) was before the invention of the cannon (about 1260).
There are those who believe it was Lief Erikson, Son of Erik the Red.