Where can I find manga with 振り仮名?
1. Where can I find manga with Furigana and 2. how you actually translate this question into Japanese: 振り仮名のマンガはどこに見つけますか。 or maybe: 振り仮名のマンガはどこに見つけられるか。

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1. Where can I find manga with Furigana

→Those are websites of the magazines for boys.
They have sample pages.

週刊少年サンデーhttp://websunday.net/
週刊少年ジャンプhttp://www.shonenjump.com/j/
週刊少年マガジンhttp://kc.kodansha.co.jp/magazine/index.php/02065

2. how you actually translate this question into Japanese: 振り仮名のマンガはどこに見つけますか。 or maybe: 振り仮名のマンガはどこに見つけられるか。

→振り仮名の振ってあるマンガは、どこで見つけられますか？

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Some manga with furigana that I have are 君に届け、神様はじめました、チーズスイートホームand 菜の花の彼。But these (besides Chi's Sweet Home) are mainly 恋愛マンガ so I'm not sure if it's your cup of tea. :)

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Okay, now give the Beginner Level :D

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1 How about this one?

Japanese Lessons with Manga
https://www.wasabi-jpn.com/japanese-lessons/materials-for-japanese-lessons-intensive-reading/

You can learn Japanese via Manga with Furigana, English translation and explanation.