There are all kinds of different reasons for why you might be even slightly interested in hiring some kind of a private investigative resource at this present point in your lifetime. Whatever the reason is behind you needing a PI, suffice it to say that your main focus right now would be to figure out where you can go about doing something of this sort. The problem with trying to hire a PI is that there is a relatively high level of likelihood that you might come across one that is not all that ethical, and hiring them can often end up doing a lot more harm to you that would cancel out any and all good that they would have otherwise been able to send your way.
Hence, it is absolutely essential that you hire a PI from some kind of reputable resource. The market is full of scam artists who are in no way licensed to provide investigative services, and if you want to ensure that you can avoid such individuals and rest assured that your PI is thoroughly competent and professional, you might want to give the folks over at Catalyst Private Investigations LLC a call.
This is an agency that prides itself on hiring only the very best PIs, and anyone that is assigned to your case would be more than proficient enough to tackle the task that you had in mind. Your reasons for hiring a PI are not important in the least. The only thing that matters is that you protect yourself from fake PIs and only hire ones that have a license to practice in your given neighborhood and locale.