Is it true that there is no objection for someone who is studying or looking for a job to delay marriage, apart from advice, and that this is based on a fatwa from a former religious guide?

You are not permitted to benefit from your father's ill-gotten wealth if you have a sufficient source of income. However, if you do not have money or a job, then you are permitted to take from it only what covers your basic needs until you find work or money. It is not permissible to be extravagant in spending from it.