Welcome Milk Man Dan (please move your milk truck off my box of puppies, by the way).
Insect Mages are the only mages who have ready access to Inhabitation Spirits, although any mage that uses Blood Magic (Blood Invoking, IIRC) can turn any spirit into an Inhabitation spirit. The problem with both of those is that they're usually KoS'd.
Otherwise you use Possession-based spirits, of which there are a few Traditions that use them (Voodoo, Psionics from the
Digital Grimoire). Basically they're the exact same spirits as normal, but replace Materialization with Possession.
The main difference would be that Possession spirits only stay for as long as you can make them, whereas Inhabitation spirits are stuck in their vessel until it gets destroyed (or if they get a True Form merge and then get disrupted).
As the rules are written, you can't really get spirits for yourself like an agent program in a drone, especially not as an Adept. As a Mystic Adept/Mage you'd be able to summon your own though.
Here's a guide for spirits that you may want to read through. It details on the last couple of points how you can do basically what you're wanting to.
EDIT: As a straight adept, I would suggest getting a Restricted Gear for a R4 Weapon Focus bound at chargen (I assume you're doing Karmagen, as you mentioned karma during chargen, where under the BP system you only spend BP to bind foci at chargen). It'll hurt your karma a bit to get one that high, but you'll enjoy it in the long run. Now, after you get that Weapon Focus, get it prepared for a
Bloodmourne conversion, which is simply adding powers to the weapon focus. The process is detailed in the thread I linked above.