how can I make batter rockets

@ColumbiaHavenXAerospace, if you want them to look nicer, you have to experiment with things like textures and colors. If you want to go further, you can download other people's crafts that you consider "good looking", and take the thing apart to see how it accomplished that. I hope this helps

@VectronTechnologies I do want nicer rockets how do I do it

First, you need to define "better". Do you want crafts to look nicer? Cost less? Be more compact? Have more Delta-V? Then, you should look at some crafts that are "good", and figure out why. Then, you should be able to use that knowledge to create "good" rockets.