You being LSE, I'd recommend looking into E1 and sp or so3 in enneagrams. If you don't relate to them, reconsider another type.
Hello, I recommend you look into classical socionics. This place is somewhat mediocre in learning socionics, it's not a very educational place.
Keep in mind, there are numerous systems or models of socionics, classical socionics (SCS or CS), SHS, WWS, etc.
A ESI in classical socionics might be an EIE or so in WWS.
Review of IME + Socionic model (classical, model a)
Socionic functions (original sources from Aushra, the creator of socionics)
The Dual Nature of Humanity
Socion
I recommend classical socionics, or the school of classical socionics since it's essentially just socionics as Aushra intended. With some additional stuff added by those who have worked with Aushra, etc.
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SCS methodology guide
Also most people on this site are run by an idiocracy.