I have the opposite opinion. If you really want to play fretless for everything you might as well start learning the muscle memory for intonation immediately.
I do think getting a teacher to provide intonation feedback is almost mandatory unless you’ve played an instrument that requires you adjust your intonation for every note before like brass or violin family instruments. If you don’t get a teacher, plan to spend a large chunk of practice time on ear training.
I have converted a fretted bass to fretless and love it!
Saying that, in terms of “sound”, the pickup adds more to the equation of tone than the fretless per sé.
I expect that you will use the fretless bass like a fretted bass, being a beginner and all, so no fretless-specific playing initially?
I have thought long about “would it be better to have started on a freltess?”.
In my opinion, it will be a little harder to get the right intonation, but you will be looking at the frets/fret lines anyway, so: it’s possible!
Best would be to get two basses that are exactly the same: one fretted, one fretless. You can easily transfer learnings from one bass to the other.
The Sire U5 that @TheMaartian mentioned is excellent - it exists as fretted and fretless versions. And in my opinion it’s easier to learn on a short scale…
I’m sure they’re lovely, but i’m a 100% set on the v7, i’m really just looking for entry level gear
Yeah i’ll probably initially learn to play it like a fretted bass and let the fretless specific stuff come in later
Buying two basses is completely out of my budget and i’m set on the marcus miller v7, i really just need help with what gear to get started with
I started B2B with a Sire U5. It is a phenomenal bass. It is not only a shorty but its headstock and body are also scaled down. It holds and feels like a guitar far more than other short scales.
But I agree with the OP on his choice of a V7, especially as a fretless. Its 34” scale and fantastic neck will provide more string tension and complex overtones than a shorty, while still playing like a dream. 
What’s your budget?
@nebel - for that kind of money he could get a classic Dutch amp!
That’s equal part terrifying and awesome. Definitely a soundtrack for a nightmare.
I’m trying to stay around (or lower than) 1000€
That’s excluding bass, right?
I’m really hoping that’s including the bass
I do plan on being a sofa player, alone, and i’m more of a haptic guy but willing to compromise for software if it gets me playing faster
I don’t think i need too great of a speaker since i have roommates and plan on playing with headphones most of the time
Ok, that leaves you about 300€, right? (You are using Euro - do you live in wonderful Europe?).
If you’re a haptic guy, there will be many people soon to give you good advice.
@sunDOG does wonderful stuff with his Hotone (Ampero? Ampero One?).
The store i’m buying for has the bass for 600€, so i’m left with 400
And yes, i’m situated in europe
You already have headphones?
Thomann has the Ampero as B Stock for 259€. B-Stock can be considered new at Thomann.
So that leaves you with some nice money to spend 
For example:
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Others might know what impedance is right for the Hotone…
No need to over-complicate things.
Buy your V7 from your local store and tell your salesperson what you’re looking for: a headphones-capable amp for personal use at home.
Also, be sure to ask for a discount based on the bass/amp sale. Chances are you can get it.
The most important thing to do is to get a bass and take the Beginner to Badass course. There is no better or faster way to learn bass fundamentals.
For bass-capable monitor headphones, the Audio-Technica ATH-M50X are excellent at a very good price point (125USD).
You don’t have to go crazy spending a lot of money to get great gear. 
As someone who doesn’t use headphones, I would recommend the Fender Rumble 40 as others have said. and a quality cable. I had a cheap cable snap off inside my Ibanez…not fun! So now I have Fender cables too
Good luck with the Sire, I’ve heard great things about them
I can vouch for a Rumble 40. It’s a great little amp. It accurately presents bass tones even at low volume, which apparently is what would work for @weirdocritter when he’s not using phones.
HAPTIC-new word for me. I had to look it up.