I could direct you straight to my learn jazz piano online video course but I would also advise the following:
Know your major and minor scales.
Learn to read at least the treble clef.
Get a basic understanding of 4-note chords such as Cmaj7: C+E+G+B, C7: C+E+G+Bb.
Start listening to some jazz players that play in a way you can follow (Horace Silver).
[https://www.learnjazzpianoonline.com]