Contact law enforcement. First try your local police department. They should take a statement, provide you with a crime reference number, and give you advice on how to handle things. They can decide upon the appropriate forensics necessary and get a professional to do them. They also have access to records that you do not. If the amount was high (in excess of $10k value) you may want to also contact an agency tasked with financial crime (e.g. the FBI, or Action Fraud UK).
Next you should contact your bank. Let them know that the funds transferred out of your account were part of a scam. They will almost certainly not be able to recover the money, but by providing a crime reference number from the police their fraud team can take steps to stop this happening to someone else. It also potentially helps them build evidence against organised crime groups.
Do not try to do your own forensics. Anything you discover will at best be inadmissible due to lack of chain-of-custody, and may also taint other evidence. Do not attempt to further contact the individuals involved either.
Ultimately you should not get your hopes up on getting the money back. Sadly there is little the police can do about international fraud once it happens. I recommend that you look into getting credit alerts set up to see if the scammers later sell your details on or try to take credit out in your name. If you run into financial problems due to the amount that was taken, you may want to look for a fraud victim support group. They will be able to provide a support network and point you towards local resources that can help you.