Newbie: General Session Concept
Hi LordAshes, welcome to RPoL.
There aren't really sessions, as such. The GM sets up the game, and players post when they can. Acceptable posting rates vary from multiple times per day to once per week, depending on the GM.
Character creation also varies from game to game. Some GMs will have you create your character and PM them with a completed sheet, while others will work through character creation with you inside their game.
Your questions will be best answered if they are directed to the GMs of any games you are interested in joining, as part of your access request.
And yes, we have an on-site dice roller, accessible once you are accepted into a game.