Patio paving advice

wingforward

I was "gifted" a load of these paving stones/tiles for a patio area, they are not really slabs, they are only 6" x 6"...

I have a couple of questions & would appreciated some advice...
1. Should these be laid on a solid concrete base...if so, how thick should concrete be, would 3" suffice?
2. As you can see from the pic, they are irregular in shape, but they are all this shape, if that makes sense!Is there any correct way to lay them out?
3. What can I use as adhesive?
4, What can I use as grout, between the joints, and how wide should the joint be? Due to the shape, some of the spaces/joints between tiles will be quite large, so I would like to do something that looks well!

Avidgolfer

can be laid on a mortar bed or directly on top of an existing footpath like tiles with a slurry cement mixture. joints should be kept between 3 to 5 mm. joint can be grouted with a product called romex easy or fugee. which are resin based and need only be swept into joints.

builditwell

These are actually tiles and need to be laid on a strong base not in deep mortar, you can use a rapid set tile adhesive if u prime the concrete first but id use a strong sand and cement mix with a liquid additive in the mortar for workability.

You can also point the joints with the same material. The romex that is mentioned is good for paving jointing but not this situation as the depth of the tiles are too shallow and will not allow sufficient drainage of surface water.