Beginner needing help!!

hello people! i'm new to hellenism and i think i got signs from Apollon and Athena. specifically Athena though.

i wanna know about altars to know about worshipping, and i think i already started. yes, i know it's not necessary but i wanna do it because she deserves it in my opinion :> what materials/stuffs would you guys recommend for a simple yet useful altar? and just to clarify, i don't have candles and i can't use bowls on my altar.

other than that, can i do ANYTHING for her as a devotional act? and can i offer her anything? those 2 are the small questions but still important for me. thanks in advance!