MoS2 has gained attention as an interesting 2D transition metal dichalcogenide due to its remarkable physical properties that can be controlled by thickness and structural phase transition. Large spin-orbit coupling, tunable bandgap and high on/off current ratio in MoS2 have prompted MoS2 as a promising candidate for spintronics and nanodevices. Since the ground state of pristine 2H-MoS2 is nonmagnetic due to spin(S)=0 for Mo4+ in trigonal prismatic geometry, significant modification in the magnetic properties is essential for realizing spin injection and spin manipulation in spintronics devices. This work addresses the challenges in making 2D MoS2 ferromagnetic. In this thesis work it is shown that the magnetic properties in MoS2 nanosheets can be tailored by defects, dopants, phase control and oxidation parameters. Defect-rich MoS2 nanosheets are found to be highly magnetic compared to defect-suppressed nanosheets.1 By systematically increasing the defect site density in MoS2 nanosheets magnetization is shown to increase by one order. Transition metal (TM) dopants like Mn, Co in MoS2 nanosheets have shown contrasting magnetic properties; Mn4+ substitution in MoS2 lattice is ineffective, on the contrary, Co dopant in MoS2 is very effective and results in a robust ferromagnetism with magnetization values 10 times larger than Mn doped MoS2 (MS=700 memu/g). 2H to 1T phase transition enabled through Li-intercalation brings a change in the spin state of Mo.2 Large concentration of S vacancies and edge defects enhances lithium intake into the system.3 Li-intercalation strongly influences magnetic properties and leads to high magnetization. Finally, we show that oxidizing pristine and TM doped MoS2 nanosheets further enhances the magnetic properties. Charge pumping studies carried out using electrostatic force microscopy on few-layered MoS2 nanosheets grown by CVD method will be discussed.