You could start here, and for more advanced analysis, you will probably need to use a combination of tools in Model builder, probably utilizing the Conditional and Map Algebra toolsets.
Now I would like to know wich tools shoud I use to access the dynamics of a woodland considering that the land-cover is heterogeneous. would that be the same?
You will need to create the land cover raster. If you have a 3 band raster, you will need to perform either a supervised or unsupervised classification to create the raster. Do this for both sets of data. Once you create the rasters, you will need to compare the two rasters for the change analysis. There are many examples on how to do this, including this link. Also here is supervised classification.