How to use customized styles in mvvm wpf coding?

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C#

XAML

WPF

MVVM

Hello everyone,

I am trying to build MVVM app with view and view model separate with no code behind in xaml.cs. Hence, I am quite clueless with the below.

I have designed my own homepage, style of buttons, lists and graphs which I need to display looks different than basic way given in datatemplates. Now my question is how to use my own designed styles in the app i am developing? also how can I manupulate styles with data binding?

Simple code that could make me understand above would be of great great help.

Please note: view and viewmodel should be separate with no code behind. All samples i seen on net is with codebehind which I am quite not looking for.
Thank you