Motorhomes For Sale By Owner What Should I Adjust On My Digital Camera?

What should I adjust on my digital camera? - motorhomes for sale by owner

I download pix from my Canon Powershot A610 with a download manager Internet as Web advertising our motorhomes for sale. If you have a certain image and go larger, the photo is huge. Our outlook is to browse, easier to see the image. I Should the resolution or compression, then? Thanx.