you can only spawn monsters in creative mode they are in the bottom of the inventory, where you can drag and place the eggs to equip them. once you have them equipped throw the eggs to the ground, then depending on the egg (there are many types eg. creeper, pig, zombie.) a type of mob will spawn. hope it helps.
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You can find eggs, those can spawn a chicken but not all eggs do, or load new chunks and they will spawn, just not where you want
No, currently in vanilla Minecraft dinosaurs are not in the game. This means there are no spawn eggs for them.
monsters do not spawn from monster spawners in Peaceful mode. Peaceful mode prevents hostile mobs from spawning naturally and also from monster spawners, ensuring the game remains free from any hostile creatures.
You can't. They can only be spawned in by a player in creative mode. (Although some mods do add crafting recipes for spawn eggs)
mobs will spawn anywhere within a 15x 15 chunk around the player. that means they can spawn from up to 240 blocks away from you.