Like Flame Bringer says;
As an AOC holder it would make sense to manage your own aircraft as a Part M Continued Airworthiness Management Organisation (CAMO)
Many AOC holders also have integral Part 145 LINE maintenance organisations and then contract out to Base Maintenance. This is where (as a Pt 66 Licenced B1 or B2 Technician in a Pt 145 Line Organisation) you could maintain your own aircraft.
As earlier explained, you have to do quite some homework and put in the practical work to get a Licence - it's not an academic qualification and a lot of practical work is required - man-hours and days, of classroom teaching and practice experience, per module, are a mandated requirement in EASA Part 66 (explained in the CAA's ELGD)
If you are working, it can take years to do the modules - there's more to being just a mechanic than you can imagine.
Finally, as an operator/pilot, it may well do you a favour to learn what we maintenance guys do and then you might understand why it is that we can't always do as the operator wants.
Good luck with whatever you decide.
Rigga