I have been asking around on how to due this kinda work but everyone tells me a body shop would be a better place to go but I don't think it would be that hard to due. So I turned to this site that has already helped me a lot on things with my late model Oldsmobile. So Thanks to yall I have been able to put some extra money in my pocket. But I uploaded some pics below of my rust problem below to see how yall think I should tackle this problem. Should it be bondo or Fiberglass to due the job. Also I want to due the job without halving to cut or weld new metal in. I want a good fix that require a lot less or hard labor and will last a long time. Also be able to due it on 70 dollars. If yall could help me put a list together of what I need to get to and or buy would be helpful. Thanks.

Well, best is to cut it away, all the rust. Then replace with metal. But your not interested in doing that.

Next you bring up Bondo. No, don't use that.

Fiberglass. Again, no.

I guess if you want to fix it on a budget, I would use tiger hair. It'* Bondo with fiber glass mixed in. Cut away the rust, put some rust inhibitor, clean up the area best you can. Then fill with the tiger hair. Shape best you can, and sand. It will take a while and will not look perfect. But will help clean up the area. You will find more rust then you see there.

havent done it myself yet but ive been doing some research because im going to tackle some wheel rust like yours. you got to cut out the bad and put like por15 on it, or similar. then to bring the area up to where you can smooth it with fiberglass, because thats all fiberglass is meant for they have this epoxy that can be shaped and is more structural.
http://www.por15.com/EPOXY-PUTTY/productinfo/PU/

For larger holes, if you use Tiger hair or kitty hair, you can use metal screen material and put that over the hole to start off with.

Sorry about the no response from me. My Internet just came back up today. It went out right after I posted the question on the form. I could care less about beauty I just want the problem fixed so I don't half to keep sucking up water from my floorboards on that one side when it rains. It has already destroyed the carpet in the car. So what grit of sandpaper should use and also what brands of rust inhibitor should I use. Also what brand of primer would be the best to go with to. If I half to due some cutting would a pencil grinder be better? Thanks

dremel with a cutoff wheel or similar

So a dremel would be powerful enough to cut steel.

i use mine to cut exhaust bolts, tubing, exhuast pipe, its not as fast as a angle grinder but sometimes thats all that will fit. home depot i think i got the tube of cut off wheels.

So my List should Include a dremel, sand paper, tiger hair, primer, rust inhibitor and screen mesh to cover the hole. Does that list finish this task up or and I missing something else on my list. Thanks.

Matching paint?
Pretty good list and advice here for a 'patch', I'll just add your only going to delay further cosmetic damage for about a year. And what you see already breaching the surface is going to continue in new spots. That stage of cancer can't be permanently fixed. Enough lasting moisture got in there to do that kind of damage, it'* only going to continue to rot.