Answer Base

I have a concrete base 3m by 4m, in my garden. i wish to pav this. how do i fix the paving slabs to the base, what is the mixture required.i have zero diy knowledge, but whant to give this a go.

Have had slabs laid , they dug out about 4 inches down laid crush and run and wacked it down , then to secure the slabs mixed 3 sand to 1 cement put a blob on each end of slab and laid them obviously checking level as they went . they said this was more secure than a sand base , took a little longer but a cracking job ........ well sorry for mentioning that they dug out i was trying to be helpful and mentioning what my proffesional people did it in case it did differ from a concrete base ... anyway 3 to 1 they used ...remind self never to answer diy question again stupid woman ...