Laichtown, you clearly need help judging from the questions you are asking.My advice would be to contact the LAA.(www.laa.uk.com)
They will put you in touch with local people who are actually doing exactly what you aspire to do.(NOT bar room experts!).
It is perfectly feasable to buy and operate a plane on your budget but it won't be a Learjet!
Where are you based?

Folks, I am based in Northern Ireland