Hello, fellow kerbonaut.
I have been playing KSP for a while and decided to become a more advanced player. Started a career mode, began as a total n00b. So, the beginning was pretty ok, but now I encountered a problem: as soon as my missions started being more advanced, the rockets turned into a mess. Now I don't bring the payload where I need it, but rather build the rocket up just to carry it's own weight and make it easier to intercept the orbit. My question is addressed to veteran rocket designers: how do I make it smaller and more effective? What should I remember and what are the presets for atmosphere escape, orbit, mün landing etc for a small rocket?