can i use soil as a medium because havent got any vercumilite for bearded dragon eggs?
That is not really a good idea since soil contains bacteria, larval forms of some insects and does not hold the temperature or the moisture content correctly. The best suited product for the hatching of eggs is vermiculite and the second best is sand, the breeders will tell you that. The next thing you could be doing is placing them in an incubator, commonly used for hatching chicken eggs the incubator will do fine for bearded dragon eggs, just make sure you get one with a temperature setting. In case you need to make the temp warmer or cooler. You can get an incubator at a tractor supply store, Co-Op or a farm supply store that sells grains and animal feed. Any store that sells farming supplies would have them or a place that sells live farm animals like chickens or ducks would have them as well. You can even order them online.
