Laying a slate slabs onto a concrete base. - Advice please

[sherbet]

I have a concrete base that was once used for a shed. It's in good order, no cracks. I want to lay a blue black natural slate paving circle design on top of it. They are machine cut but still vary a little in thickness.
What is the best method of laying these? I keep reading conflicting results! Whether it should be dabbing each corner with mortar mix or onto sharp sand and cement mix. I'd prefer it not to be cement mortar direct onto the cement base as you never know that at some stage I may want to change it and then they'd be hard to remove. So what would be the right method please.
How do I deal with drainage or is that not a problem? the area is approx 2.4m squared. And is just a patio in the garden not joining the house.
What about the pointing or can grey grout be used?
Any advice much appreciated as I've never done anything like this before but would like to have a go! Many thanks

[rab1]

grab yourself a beer and read the main site as all the information you require is explained in great detail :;):

[lutonlagerlout]

as you never know that at some stage I may want to change it

best not to do it in the first place then
LLL