So, what exactly is the error message you are getting.
And, yes, topo to raster should do a reasonable job of interpolating the contour lines into a raster.
Don't forget that you seem to be dealing with 2 separate things here - bathymetry, which i take to mean an elevation surface. Watch out for signs here. ie is it negative, below sea level.
And isopachs, which I take to mean thickness of a certain layer.
If you want to use other methods you could convert the lines to points using one of the conversion tools.