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When starting a guild you can have a max of 100 players. Then by doing dailes and other guild quests you can increase the amount from there.
When declaring a guild war a guild then builds 2 towers and 1 big tent for their command centre, which will act as a respawn point during the siege area. The winning guild takes out the other guilds 2 towers and big tent. The top winning guilds in GvG during the week get access to their own castles, for the first week. Then later top winning guilds in GVG get the right to lay siege's to castles.
PVP doesn't show red players, so you have to read their guild symbols to tell the enemy apart. In GVG you can also have an alliance with other guilds but they can betray you at any time. I expect to see many shenanigans.
*** Steparu always shows the game in his videos with full effects. But there are sliders for both camera shake and skill effects that can be toggled from 1 to 100. The effects are not so bad when you're actually playing the game, but the fast-paced gameplay and Youtube compression makes the videos weird, and hard to know what is going on.