Okay, as a person who both lived in null and lived in null alone, ill answer this.
First, how many accounts you want, depends on what you want to do and how much you want to risk.
If youre getting any capital, you will need a cyno alt. So thats atleast 2 accounts.
Titans are useless alone. Best use is a carrier or supercarrier.
Depends on what you mean by “successful”, but just one, i suppose.
If you go for a rorqual though, it will be a very juicy target, and you will be hot-dropped. So the risk is high, especially if youre alone, and even if youve got a carrier or super standing by, without a support fleet, you will be a very juicy target.
Captials, a minimum of Sotiyo, Fortizar or keepstar.
Super capitals, like titans, only a keepstar.
So youll be looking at a minimum of 10 billion isk for regular capitals, and 100+ billion to dock a supercapital.
Depends on the renter, but most places will ask anywhere between 1-5 billion isk a month. Whether they offer protection, is up to the renter, but best not to rely on them.
Price will differ based on location and whats inside the system. A system that is a quiet dead-end location will cost more, a system in the middle of a traffic route will cost less.
All in all, youre looking at:
10 bill for a structure.
2-3 bill monthly to rent a system.
10 bill for a jump freighter.
10 bill for a rorqual.
2-3 bill for a carrier.
and two 20-30 million skill point characters.
If you go for a super, youre looking at:
100 billion for the structure.
15-20 bill for the supercarrier.
Its doable, but risky, and costly. 50 bill starting, plus 2 characters with 20 mill SP, is the minimum you’d need.