Find the month of March on the ecliptic and then go to where it crosses the equator. This should be around March 21. This is the first day of spring, or the vernal equinox . This is the starting point for measuring right ascension. Even though globes give the most accurate representation of the Earth and the sky, they are very inconvenient to carry around with you.
Most people carry maps, which can fold up, in their cars rather than globes.
The same is true for locating the stars in the sky. A planisphere is a type of map for the stars. This gives a 2-dimensional representation of the stars' positions. If you look at the constellations on the globe and then the same constellations drawn on the planispheres, you should notice that they do not look the same. The ones on the planispheres are distorted because the three dimensions of the globe have been flattened into a disk.