Question about shaping a sphere

Hello everyone,

I’m a complete beginner with Blender and tried to model this


this was the best i was able to produce



Now to my question… i thought beginning with a sphere would be best. But i’m having problems with forming an oval shape with a sphere. Is there a way to shape it evenly on every side at once?

Thx in advance!

One option is to use proportional editing (shortcut O or option on 3d view header) with a UV Sphere object
Select the top/bottom vertex and move up/down. Adjust the proportional falloff with mouse scroll wheel to adjust the shape

Demo http://screencast-o-matic.com/watch/cb1DoyXSK3