I am going to buy the Canon EOS 650D camera.

At the moment I can afford one of the following lenses:

1. Canon Lens EF 50mm 1:1.8 II + 18-135mm lens in future
2. (Kit) Canon EFS 18-55mm IS II + 55-250 lens in future

My question is what is better for general purpose photos?

Also, is the focal length for the mentioned above lenses the effective (50mm/18-55mm for works the same way as 50mm/18-55mm for full-frame sensor), or factional (50mm/18-55mm works as ~75mm/~30-80mm for full-frame sensor)?