hiya, a couple of previous posts to get you going

• Who created the idea of vikings having horns on their helmets - featuring now-deleted username /u/Boddhidharma

• Googling 'authentic viking helmets' still comes up with cow horned nonsense. I live in an Irish town on the Shannon, the year is 830, and the Viking longships have just beached. What are the raiders actually wearing on their heads as they storm ashore? - featuring /u/Aerandir

• Were full-face Viking helmets, like the one found at Sutton Hoo, regularly used in combat? featuring /u/EyeStache

• Question about viking armor - featuring /u/alriclofgar

ed: added a couple more