Hi Sebastian, you can find information on the different source estimation methods in this tutorial:
https://neuroimage.usc.edu/brainstorm/Tutorials/SourceEstimation
In there, there are dedicated sections for LCMV and MN.
About DICS, it is possible to use the FieldTrip function ft_sourceanalysis() with 'dics' as method.
The process is located on: Sources > FieldTrip : ft_sourceanalysis (DICS).
There is a correspondence one to one with the arguments of the ft_sourceanalysis(). However, we have not prepare a tutorial to exemplify its use yet.
