How do I replace my oil pan

There are a few issues that may cause leakage from the oil pan. If it's leaking from the sump plug, that is the bolt you'd removed to change the oil, the seal could be old and/or cracked, or the bolt might be loose. Getting an oil change and asking for the sump plug to be replaced should be relatively inexpensive.
The other likely possibilities are the oil pan seal is cracked, the bolts holding on the oil pan somehow loosened, or the car was driven over or dropped onto some large, hard debris, and the oil pan itself got bent.
If it's not easy to determine where the oil is leaking from when looking under the car, it could also be from somewhere else in the engine, and dripping down onto the oil pan.
In any case, a reputable shop put the car on a lift to get a good look at the problem, and give you a repair estimate.

Only a trusted local auto service shop or dealer can answer this for you because your vehicle would have to be up on a lift to actually see what's leaking in order to properly diagnose and repair. It may be as simple as changing the oil pan gasket or a cracked oil pan that would have to be either replaced or repaired depending on the size of the crack. There is also the remote chance that its actually something else that's leaking. Hope this helps.

unfortunately theres no way to prove where the damage was done. maybe you can work something out with the garage to get you a cheap oil pan

Most likely you just need to replace the Oil pan seal. A dent normally doesn't cause a leak. If the pan is cracked then yea, you will have to replace the pan. If it is leaking around the seal area it may have been knocked loose when you hit what ever dented your pan to begin with.

Nothing else you can safely do but to replace the oil pan. Trying to repair the oil pan on the vehicle might prove dangerous. Remove and replace.

MOST TIME DUE TO HEAT AND STRESS GASKETS GET HARD OIL SOAKED BAKED AND CRACK.THEN YOUR VALVE COVERS LEAK.TIMING COVER CRANKSHAFT SEAL LEAKS.REAR MAIN OIL SEAL LEAKS.OIL PAN GASKETS LEAKS.THEN THEY HAS TO BE REPLACED.

The cost of this will vary from place to place, but if your doing it yourself then thats going to save you a bit of cost.
From what I've seen an average cost of a second hand oil sump(Pan) was $ 130 - $ 200 USD. This should only take and 1 - 1.5 hours to do.
The cost to have a workshop replace it will depend on hourly rate of the workshop. There are also other cost of replacing the oil and a gasket for the oil pan. Hope this helps, let me know how you get on.

Jason

The only problem we have with the oil pan is that drain plug gasket leaks if not change out at oil changes. I replaced one pan due to threads coming out. But as for stress cracks, little fine lines, normal. They don't leak, leave it alone. Don Suzuki tech

you probably need to replace the oil pan gasket, unless the oil pan itself is cracked then you will need to replace the oil pan

If you have a bad or leaky freeze plug, also known as soft plugs, it needs to be replaced. Your brass plugs are the best, and in some hard to get to places there are rubber plugs that can be adjusted to fix the problem. But if you have oil in the oil pan, assuming no one put water in the engine. You probably overheated the engine enough to acquire a cracked head gasket. Normaly that's the problem, could be a cracked head also, but more than likely a gasket. If you decide to remove the heads and replace the gaskets, good idea to have the heads resurfaced. (recommended)