Investigations of origin and interplanetary propagation of
Coronal Mass Ejections (CMEs) are very important toward understanding space
weather phenomena. The objective of the talk is summarize the works carried
out by us toward understanding the CME propagation from its early stages to
near-Earth region. We have statistically explored the differences in CME
propagation characteristics of the rising phase of solar cycles 23 and 24
using LASCO initial and 1 AU observations. In order to be able to provide
some prediction techniques for geoeffective CMEs, we discuss the
relationships between CME initial parameters and corresponding
Geo-effectiveness (i.e. Dst; geomagnetic storm disturbances index). Using
these relationships, we have developed forecasting empirical equations for
transit time and Dst as the function of CME initial parameters (i.e., like
CME initial speed and direction parameter). We further provide a detailed
discussion on different observed ICME structures at near-Earth region, viz.
magnetic clouds and ejecta, and assess their significance with the level of
magnetic activity of the solar cycle. We finally present the
multi-wavelength and multi-point observations of a complex, major
geoeffective CME of solar cycle 24 and discuss its evolution from the
near-Sun to near-Earth regions.