Then look into buying my first aircraft (ikarus C42 probably), do the relative instructor course and then start
No problem purchasing an aircraft - All you need is money.
No problem doing the instructor course - All you need is experience, skill, knowledge and money.
It's the "and then start" where the wheels (temporary) come off your waggon.
As a new instructor you have to operate at all times under the supervision of an experienced instructor. You can not sent students on first solo or first solo navigation exercise.
Therefore you will have to either;
a) Find work as an AFI and gain experience and get the QFI; or
b) Employ an experienced QFI as your CFI and while you manage the business you can also work with them.
Finally if you are at the position you say you are at now, it is not just the current legislation and operations of training organisations you need to be looking at. What you need to fully plan for is the future and how eventually EASA rules will apply to not just your operation but also how such future rules will affect people in 10 years time who wish to learn how to fly microlights.
I recomend that before any outlay on an aircraft you get your NPPL with a reputable training provider, gain experience and do the AFI course. Then after working for some time as an AFI, ask yourself again about your business plan.
Regards,
DFC