Hi and welcome in the "family"
Reading about your past you seem to work with a DAW (not with a scoring program)
So I recommend finding a user in your region which can show you all the necessary basics for each piece of software. You will save a lot of time because it is very hard to begin with such a lot of different and complex software (VI, VE, MIR,...). Each will use a lot of time for going "into depth". So it is important that you only get the basics first. Otherwise you will be lost in all "those worlds" (VI, VE, MIR, ARTICULATIONS, DAW, MIXING MATTERS, MIDI, EQs, COMPRESSORS, ...)
Once more I recommend an experienced user who can sort out what the basics are. This could be a successful start:
a) How to integrate the Vienna Instrument and how to manage articulations?
b) How to select articulations (and also probably when and why to select different articulations)
c) How, when and why to treat the VI's output signal with effects?
d) Some basics about mixing Audio-Signals...
After that: Create a small piece of music with all your collectetd experiences.
My opinion is, not to use any other software than the Vienna Instrument until here and eventually some SUITE Effects - just for keeping the overview. Knowing the VI a bit it is time to go on with other VSL software products. Could be that you are able to learn the use of the next software yourself (with videos, tutorials or with manuals). Next software could be:
e) Using the Vienna Ensemble (when, why)
f) Using MIR, the automatic mixing and reverb system.
g) Create a small piece with all your current knowledge (a piece of Handel's Water Music... or similar).
After that: Collect more experiences with further (your) pieces.
You will have further questions. Their answers will take you to the next levels and so on.
Final remark:
You should be very patient and give you a lot of time for reaching the final aim: natural sounding music. There are so many abilities and practical skills involved... be happy about every little step.
All the best and a lot of success
Beat