Your first reply/quote is your keeper.

Go back to the next post you want to quote from and reply to that.
Cut and paste your reply into your keeper (by editing the keeper)

Only submit the keeper. Don't submit the other replies that you made cut and pastes from.

As for photos, you need an account like flickr or photobucket where you can keep photos you want to upload. They will enable your photos to have an [img] code and web address instead of posting them as an attachment.