Thanks everyone! I already have dog walking insurance, took it out when I started taking my friend's dog out with mine, it's about £13 a month so a small price to ensure I have cover in case something goes horribly wrong.
I will walk other dogs separately to my pack as I already take 5 or 6 and wouldn't want to add to that. I can manage them because 4 are mine and the pack has gradually increased in size. I had my dog, then started taking a friend's out with mine, then another friend's dog joined, then I got another dog, and another and then one more! I love dogs and like walking, we generally do between 2-5 miles a time, depends where we go. I like to do a mix of pavement and field walking, helps keep their nails down and I feel we bond a lot when they are walking to heel on lead and then they have off lead or long lead fun when we get to the fields. Two of mine don't get off lead because they just want to go hunting in the undergrowth for hours and can't be reliably recalled when they are in the 'zone'. I would never let a dog off lead if the owner said not to! They know their dog best and no way would I risk injury (or worse) to a dog I was caring for.
I don't want to charge a fortune (where I live it seems to be between £8-£18 a walk) or take loads of dogs at once (I see some walkers with more than ten, they all look happy and under control but I wouldn't try it myself!). I would just like to get a little group of between two and four dogs who got on and came out with me for lots of walking and fun.
I wouldn't call myself an expert on dog behaviour but I did train my first dog at class and we got our good citizen silver award and I have learned so so much from watching my dogs interact with each other (I can watch them for hours, their communication is fascinating). I have trained all of mine (and the two others I walk) to walk nicely on lead and wait properly when we are crossing roads etc.
The proof of walk is interesting, I don't often take photos cos my hands are full and I'm busy concentrating on what they are all doing when some are off lead so that's something I need to think about.
I would definitely want to meet dogs with their owners initially and take some history, including medical, any fears/obsessions, emergency contact numbers for owners and their vets details etc.
I adore dogs and would want them to be happy coming out with me, to have lots of fun when they are out and to go home nice and tired. As we all know, a tired dog is a good dog!
I could offer weekend walks sometimes but couldn't do pet sitting.