How would i go about retopology for this object? I am a blender newbie and have modeled and sculpted this tombstone with a cool symbol and some cracks on it but somewhere along the line it made the whole mesh made of tris...



  

I'm assuming that this is a problem for retopology so, how do I fix it and then how should I do the retopology? Thanks for your time.
The quickest method I like to use is a remesh modifier and a decimate modifier. Works nice and fast. This tutorial might also help https://www.youtube.com/watch?v=rUzJefYNQlI