New-to-it-all Needs Help For Setting Up Options

[Humaniversally]

Hi everyone

So. As the title says I'm new to it all - and I mean all (I've been basically playing acoustically for 40 years) - and I'm setting up a small home studio with the gear I had and some I just bought and some questions came up - among a great many (I'll be back ).

First off : As, for now, I'm planning to route everything through a mixer, the question arises: where's best to input its output in the Inspire - run its 1/4" in channel 1 & 2 ? or its XLRs ? Or use 1/4 to RCA cables to the back line-ins ?

And also : Can the remaining Firewire port of the Inspire be used for something else than another one ?

Also : As I plan to use my mixer (while eventually I want to upgrade to a bigger interface) the question arises : is the overall sound's quality significantly improved if I input my guitar and guitar-synth directly into the Inspire ? ...though one thing that bugs me here is that I'd lose the use of my GSP which I can use for everything with the mixer.

Finally : As it comes up. . . What's the best way to input my Ovation - would it be a good idea to go straight into channel 1, mic it on channel 2, and blend the two ? ...just an idea.

That's all for now. Thanks in advance.
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Be well, B.

G4.1.25Ghz.1.25GRam.240G.Presonus Inspire 1934. Logic Express. Garageband. Audacity. Hydrogen. Behringer Eurorack MX 1604A. Midisport 2x2. Digitech GSP 2101 Artist. GR33 Guitar-synth. Godin Jazz Multiac. Ovation classical with Fishman. And one old Martin.