What is a good beginner interface + software?

We're currently looking for a good and cheap USB DMX interface that runs without stutters and a suitable good and user-friendly software (lifelong not only annual license). The software should be able to program good shows (ideally with a timeline). The interface should have 512 channels and run on a slow PC or laptop.

I use the FX5 from Digital enlightment and my software is called Freestyler…

https://fx5.de/

http://www.freestylerdmx.be/

the FX5 is also available as a kit if you googlest afterwards…

But there's no timeline in freestyler