Mike Kimmel
Developer
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Read the Gamemastering section of the book, it has tons of information about how to build encounters and reward the PCs. A party normally receives XP rewards for each encounter overcome, not on a "certain amount per session" basis.
A level 2 party will most often fight against CR 2 monsters, which provide 600 XP each. More difficult monsters will reward higher amounts, while weaker monsters will reward lower amounts.