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I am thinking about to start sculpt some things but i dont know what kinda sculpting material I shall use????

Depends what you want to sculpt.

Milliput is hard and brittle when dry, and dries with air. A common use is adding mass to the bone sections before covering with GS or the like.

For larger sculpts you could try polymer clay - Like Fimo or Sculptey these harden in the oven at low tempratures.

Do you want to sculpt something from scratch or do you want to decorate and modify already existing models?

For the latter green stuff is a widely used material that can be used for nearly everything. It has some downsides on technical details with sharp egdes. And as it is somewhat rubbery it doesn't take sanding and other kind of late rework as well as some other products like brown stuff or milliput. But on the other side pure milliput is very unforgiving and can be hard for a beginner to get fast results. And it might be to brittle for some applications.
I personally mix milliput and greenstuff together in various ratios to do my sculpting. Mixing them will get you a hybrid of both. You could probably used other putties like brown stuff that work the same but for me it is much cheaper to mix than buy pure brown stuff. But you probably have to find your own way of doing it. Non the less milliput and GS is a good and not to expensive starting point for your sculping experience.


And should you want to build an entire model from scratch most of the stuff said earlier still applies. But there is also the important part of building your armature. A wire armature wrapped in a thin layer of pure miliput is a decent start for a model. On larger models metal foil also does a good job as an inexpensive filler material. The cheap milliput (of the foil covered in milliput) can be used to bulk out the basic shape and the GS then can be used to add the details on top of that.
The advantage on the already mentioned polymer clays (fimo, sculpey, ...) is that you can still rework what you have already done until you put it in an oven. It is a different way of doing it but it can be helpfull for organic models - for example if you sculpt your leg after the torso you can still rework the torso and blend the leg into it as both leg and torso aren't cured. But here the armature is much more important as it has to be stable enough or the model might warp if you apply to much pressure. The advantage allows for less plannig as you can fix up a part much more easier if it doesn't fit. But on smaller models it is not advised to do everything in polymer clay. Just think about adding an armor plate to a model. The pressure of sculpting the plate will be transphered to the body as way and might warp the whole model. So a mixed approach is needed - first build the man body and back it and then add the details in a second step. But the material will get more and more brittle each time it is baked. So doing the details with greenstuff (or other putties) is a good way of combining both sculpting types.

I have tried polymer clays for a few times and i prefer the self curing epoxy putties (milliput, greenstuff, ...) but that is a personal preference.