Hi, yes have tiled many years ago but I haven't tiled a floor before. Would normally get a pro in but I am renovating a house from top to bottom so the budget is tight. Self leveling was my first thought. Will probably use flexi grout to reduce risk of cracking. Doing 5m x 3m. 30cm tiles. Presuming I don't need anything like ditramat.
A six inch deep new concrete flor has NOT dried out in 4 months. 6 inches will take about 18 months to dry fully. You will need something to controll residual moisture e.g. Ditra matting or a liquid dpm.