I agree with @LievenDV try to build some basic tones.
Learning how to use your amp is an essential part of electric guitar, but modern modelling amps do have a lot more options than more traditional amps.
So, whilst learning how to use your amp is important, you don’t have to learn every feature on it. At least not all at once.
The trick, in my view, with any modelling amp or pedal, is to ignore any on-board patches and learn to build tones from scratch. I don’t know the VT15 specifically, but the process tends to be the same for all of these systems:
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Start with a blank slate: turn off all effects
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Choose an amp model. Now is a good time to try out all the individual models available to you. The main thing is to find something you like that is close to the sort of sound you are after. Remember to play with the gain control to find out how the amp reacts to it.
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Tweak. Play with the gain and tone controls (usually bass, middle and treble, but sometimes “presence” as well) to sculpt your sound. Try with different pickup selections on your guitar and try playing softer and harder to test the dynamics.
Note that for a “clean” tone, a lot of people like to go for something which isn’t entirely clean, which is often called “edge of breakup”. This is when, if the guitar is played hard and loud, there’s a tiny bit of overdrive or “grit” but played normally, it’s quite clean.
You can also experiment with the guitar volume knob to see how that affects the sound.
- Add effects, but only when you have your baseline guitar tone. Start with reverb and play with that for a bit to get a feeling for the different types of reverb that are available to you, and how they sound at different levels.
If you can create 2 or 3 baseline tones, and can save those for later use, then you can build on them by adding more effects later.
If you have the option to use a PC based editor to make the changes, I would consider it as the PC based apps are often easier to use than trying to build tones through the amp directly.
Cheers,
Keith