First, let me also add good luck..
Second, do you know there is a bidding site on the web for charter
runs? Your customers know about it... You do have competition (oh boy
do you) and it may be 3000 miles away, but they will be competing for
your clients, offering LearJets and Turboprops at or below your cost
for a piston plane... How can they do that? Simple, they have a run
from A to B at full price - a run you can't do at the cutomers
requirements because you can't match their speed and weather topping
abilities... They can then deadhead back to A, or they can offer to run
"your" job at less than your operating costs because it puts them
closer to being back to A...
Now, if you are single, don't mind sleeping in your plane and eating
out of a paper bag, then you MAYBE can survive in the charter
business...
Do your homework, and again, good luck my friend...

denny