I want to create multi page form for my complext dataclass and convert them map or list and send to firebase

Question

ı want to create step by step form but ı cant make it ı have been strugling about 2 weeks. Fİrst of ı want to creat screen like in the left. I will bring a different form to the screen according to the option selected at first. It can also be a page with dropdownbuttons, it can also be a menu with a texteditingcontroller form . And in the last step,I want to send the data I have received from different forms to send to firebase.

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ı want to create step by step form but ı cant make it ı have been strugling about 2 weeks. Fİrst of ı want to creat screen like in the left. I will bring a different form to the screen according to the option selected at first. It can also be a page with dropdownbuttons, it can also be a menu with a texteditingcontroller form . And in the last step,I want to send the data I have received from different forms to send to firebase.

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enter image description here ı try to create bloc pattern but ı couldnt