I recently acquired my first bonsai. Its a juniper and its only about 10cm in height. Im just wonder what i should do with it at this early stage (if anything at all). I have attached pictures

Also i bought a little ficus from the markets, its only cost me $1 and i thought i could put it in a pot and see if i could bonsai it in the future. please comment as i have attached a picture.
And then there is this much big ficus that i have obtained through a friend (pictures attached) Please let me know if any of these have potential to be bonsai plants. and if so how you would go about pruning/ potting (regarding seasons etc.) Thanks