Hi Gill, welcome to Purrs!
There's been some very sound advice already given by Liz and BC, and being a cat and dog owner I'd echo what they both say - especially the fact that multiples of dogs react in diffrent ways to sole household dogs. BC - love the piccie!
Our dog loves cats, (particularly kittens - she seems to know she needs to be gentle), but she knows her place. (she's a beardie collie cross, so quite large but bright)
Introductions need to take place under close supervision, preferably somewhere where there are places the cat can access that the dog can't - ie higher up, or a gap narrower than the dog can run into, in case they feel intimidated.
Often rescues will have some knowledge of whether a cat can socialise with dogs and will be able to tell you a little about how well they react, and vice-versa.
With regard to location, I'd agree - as long as the road is not busy, then you should be okay, although if it was something you'd consider, some people on Purrs have very successfully cat-proofed their garden, to enable their cats to have full access to the outside space without being able to risk life and limb on the roads. I also have a friend who did the same very successfully at two of her homes, having lost a number of her beautiful cats to rural road accidents. It doesn't look instrusive if done properly.
I hope you find lots of good advice on the forum, and soon enjoy the welcome addition of a cat into your lives again.