No, its not like that. You do not have to give the bayah to a Zaydi imam to be a Zaydi. neither do you have to retake your shahaada or take a ghusl!
It is simply the acceptance of Zaydi creed and jurisprudence to the best of your ability. Once this takes place, you are a Zaydi.
Regarding resources in English, we are working on that and have completed some basic texts. However, the BEST thing to do is learn the Arabic, go to Yemen, and study under the scholars! Nothing beats taking your deen from the men and women who have succesively inherited the religion from their blessed grandfather, peace and blessings be upon him and his progeny!
Until then, we hope that you benefit from two basic texts on the creed and jurisprudence (tahara
). Both of them are available on this forum. The first of them is the text on creed, Iqdu at-Thamin
. The second of them is a text on the purity and prayer. It is called At-Tajrid
. If you cant find them, maybe you can contact the forum administrator and he can help you.
If you have any other questions, please dont hesitate to ask!
And Allah knows best!