Editing Wedding Photos in Lightroom

I'm a wedding photographer and while I can use Lightroom I don't always have the time to edit my photos for my customers. I usually take around 350 pictures and will need them editing in Lightroom. Nothing too fancy, just getting the right look in a few of them and then using that as a preset for the rest. Additionally, I usually add some kind of effect to around 10-20 of them, such as selective colour. I have a wedding booked for the 4th December and will take around 350 pictures. I want a price to edit them and add selective colour or similar effects to around 10-20 of them. The pictures will be available on Dropbox and will need uploading to a separate "Edits" folder on Dropbox. This is simple work for someone who has done it before as you can just create a preset and add it to the rest of the pictures.