Welcome.
First of all, it's not marker, it's RIF or IF depending on it's colour. RIF is realistic imitation firearm, IF is imitation firearm (aka two-tone). Or you can say replica, or airsoft gun.
Coming from paitball usually it's hard to treat airsofters equal and for airsofters it's just as hard to treat paintballers equal. There seem to be a bit tension between the two.
Both have their positive and negative sides, they are just different even though they are so similar for the outsider. So you have the advantage that you already know much but there are many-many things to unlearn.
Anyway, it's fun. Welcome.