So iv'e decided pretty much what I want to do with my celica as far as performance goes, but for the meantime I'd like to work on the interior. Any ideas on where to start or what to do?
Seats?
center console?
lights?
Gauges?
Steering wheels?
etc.
hopefully cost efficient ideas.

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Its really down to personal taste, maybe just to start give your interior a refresh and clean it up, I know I had lots of things that fell through the center console from the previous owners. As far as cost efficiency, Don't go to cheap on Ebay with your steering wheel or seats, they are after all safety components. Look around the site, maybe pull some inspiration from some of us on here. That said, welcome to the site

definitely hit up the interior section of the forums. LOTS of info on what you're needing to know.
and I agree. Don't cheap out on steering wheels and seats. anything else is fine.

cheap options for seats would be 7th gen seats if you can find some. steering wheel can be swapped between most toyotas so you can update the look.

plug leds whereever you can for under $30.

then buy some vinyl wrap or spray paint and paint/wrap any trim pieces. Not really my thing but just a suggestion.

interior lights are something that is cheap and easy and can make the interior look much better. I started with changing all the speedo cluster bulbs from the horrible stock green to a bright blue and it made it look so much nicer. For a few bucks you can learn alot and its pretty simple