All steps to F1 begin in Karting. then can you take steps like this

1 Formula Reanult 2.0/Formula BMW/Formula Ford
2 Formula 3/Formula Reanult 3.5/Formula Two/GP3
3 GP2/Formula Reanult 3.5
4 Formula 1

If you go to Formula Reanult 3.5 than you direct to F1 after that if you have luck. Gives also more series but this is the most normal