There is no 'commander' for SH4 regretably.
I suppose the most important thing is to get the uboat expansion (V1.5) not necessarly for the addittional content but for the patches it contains.
Secondly you will JSGME but your probably already familiar with that, however you will need a new installation into the root of SH4.
Once you have that installed and working move on to the mods. There are two 'major' ones ... TMO & RFB.
I would suggest you spend a little time in the modding section and do a little homework on which you would prefer.
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