If it seems like nonsense to command love - clearly we are misunderstanding the instruction; since the modern idea of love as intense emotion cannot be 'commanded' (although it can sometimes be manipulated).
I think the meaning of the commandment to love God is quite simple: it is that we must acknowledge the objective reality of love. And that this acknowledgment should be the foundation of all else.
Pick that apart... Love is a reality, therefore not an illusion; it is something that is of universal validity and knowability - therefore not just a 'psychological' emotion that happens 'inside' an individual person's head and body. Since it is a foundation; love is potentially eternal - therefore not a temporary, fragile, corruptible thing.
The commandment means that love is The most important thing that Beings can do.
Furthermore, as well as being real - love is Good.
We are being told that love is the primary value; that love is more important than anything else.
And told that there is No Conflict among loves.
When we think there is a conflict, it is because of our failure to understand.
There is no conflict among loves for the same kind of reason that there is only One right course of action in any circumstances. So-called 'moral dilemmas' are merely a consequence of trying to reduce the unique specificity of true morality to a System of (inevitably, intrinsically) generalised, simplified and partial Laws.
True Morality is the One Right Path. True Love is which sustains creation and enables us to participate in creation.
In being asked to love God first and foremost - we are actually being told that love of different Beings and (and love of so-called Things) can never be in conflict - that all specific loves (eg of specific people) are instances of the general objective reality of that love which holds-together the universe of reality.
We are Not being commanded to love God 'more than' our wife, children, parents... we are instead being told that the objective value and goodness of these specific loves is only possible because we inhabit a creation that is itself founded-upon love.
Because, if we did Not inhabit a loving creation; then love really-would-be just a private emotion in a mortal world - love would be certain to decline with age and disease, sure to be destroyed by death.
So, the commandment to love God first and foremost is actually that which enables, sustains and makes serious all other loves. It is simply a recognition that love is the cohesion of creation.