Refer the below example and make the changes as per your required object. https://developer.salesforce.com/forums/?id=9060G000000BdiTQAS
After completion, follow the steps mentioned the below link. https://salesforce.stackexchange.com/questions/120891/launch-vf-page-after-record-type-chosen
If this information helps, Please mark it as best answer.
You need to create a VF page.
Refer the below example and make the changes as per your required object.
https://developer.salesforce.com/forums/?id=9060G000000BdiTQAS
After completion, follow the steps mentioned the below link.
https://salesforce.stackexchange.com/questions/120891/launch-vf-page-after-record-type-chosen
If this information helps, Please mark it as best answer.
Thanks!!