Easy...
well first it is an idea...someone thinks of it up and decides they want to make a law...so a bill is thought up.
It's then proposed...a Representative talks to other Representatives to gather support for it.
Once it's proposed it's sent to a committee, to be reviewed, researched and revised...it's then sent to the House floor.
After that, the bill gets debated...and it gets voted on.
After that, if the bill passes the House of Representatives, it is then sent to the Senate. It's done with the House.