What it the significance of the fact that Yisrael's first stop was "Sukos"?
Nefesh Shimshon (Sukos): Sukos is where Yisrael dwell after they are saved [here, from slavery in Egypt]. 3
As implied in the word itself - See Peirush Yonasan.
Sefas Emes (Devarim l'Sukos 651, citing the Zohar): After Yakov was saved from Esav, he went to Sukos, for after Rosh Hashanah and Yom Kipur, the Satan chases Yisrael, and Sukos is the protection.