If by “1st aara” you mean the first era (the beginning of the current cosmic cycle) in Jain cosmology: the first Tirthankara of that sequence is Rishabhanatha (Adinath). He is considered the first perfected soul who preached the path to moksha. After him come the subsequent Tirthankaras in the long sequence that ends with Mahavira in the current cycle.
Gods (devas) in Jainism are celestial beings who exist in various realms and often witness or participate in events around the lives of the Tirthankaras, but they are not creators or ultimate authorities. They are also bound by karma and subject to the cycle of birth and death.
In Jain tradition, there are 24 Tirthankaras in total. The 24th and last in this cycle is Mahavira. The exact list and order can differ slightly between Digambara and Śvetāmbara texts on some minor details, but the core sequence and Rishabhanatha as the first Tirthankara are widely agreed.
If you’d like, I can point you to Jain scripture passages that state who the first Tirthankara is and how the devas relate to the Tirthankaras, with precise verses and traditional interpretations for Digambara and Śvetāmbara traditions.
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