Here are some helpful links for resources on medieval stuff, in case you need help knowing what armor is appropriate or what weapon is actually used for what, so here are some basic resources, idealistic resources, and historical things that may (or may not) help you with names, character design, or RP design. Add to this list if you wish.
http://www.medievalwarfare.info/armour.htm - For those whom need help with what Medieval armor is like
http://www.medievalwarfare.info/weapons.htm - For those whom need a idea what kind of weapons are often used
https://en.wikipedia.org/wiki/Hajduk - A group of bandits from Slav land
http://www.smithsonianmag.com/smart-news/why-were-medieval-knights-always-fighting-snails-1728888/?no-ist - Knights fighting snails and reasoning why monks did this.
https://en.wikipedia.org/wiki/Feudalism_in_the_Holy_Roman_Empire - Giant German death empire and it's politics (and cool German titles)
https://en.wikipedia.org/wiki/Feudalism_in_England - Brian's home country and stuff that revolves around feudal England
https://en.wikipedia.org/wiki/Barbary_pirates - Where the term 'corsair' comes from and their addiction to galley slaves.
https://en.wikipedia.org/wiki/Medieval_warfare - Medieval battles an' sieges for those whom need a idea how they usually went down.
https://en.wikipedia.org/wiki/White_Company - Medieval mercenaries