No to the location bit. It'd be one thing if it were Sweden, or Germany or the Scotland area for english servants but Poland is far enough away that a location bonus wouldn't apply. You can join in but so far most people are doubling up someone would need to volunteer to be your character's master or you'd need to make a master for your servant. [@Migyudon] has expressed interest in a caster role but he has also said he'd play lancer. I'd be fine with rolling Saber in that case. It's up to you who you want to play as a servant though I'd run things by me before getting started on any finite ideas.