Oil pan gasket replacement- steps, parts required

What is your question?

I'm attempting to replace the gaskets to my timing cover water pump and oil pan. Just need help figuring out the steps to pull oil pan and what parts will need to be replaced. I have water pump, timing, the shaft seal, another gasket that came with kit. I was told car leaks oil when sitting for to long. Came out of the store the other day after doing some errands and found a large puddle of oil underneath the car. Was also told timing chain was replaced but old gaskets were reused... Is this repair the correct fix for what's happening?

What makes this problem better or worse?

Adding oil, sitting to long, and oil additives

How long has your 2006 Pontiac Grand Prix had this problem?

2weeks