The House is more about speaking on behalf of the people in a direct way; and the senate is more about representing the states.
Based on their population, states have different numbers of Representatives and yet 2 senators.
Therefore, initially, a representative sponsors the HR2520 Act, then HR2520 will be studied by a committee, next it will be voted on, or debated; if HR2520 passes by majority, then it will move to the senate.