Convert vb6 to c# winform

Question

Hi everyone I am supposed to rebuild an app that already exists in vb6. This app allows a group of users to perform a series of crud operations on a series of clients with forms and some financial math based operations based on government lows applied between certain dates. I started a simple winform c# app but am wondering how to create the child forms. Should i design the labels and textboxes and all controls with the mouse on all forms (30 or 40 forms)? or... code them and how ? Or should i go with some other technologie ? I have about 3 years in Web Dev. Thank you Best Regards