Hey,
I also restored my Celica, although it's the T23 model, I think one can use this as a blueprint for other vehicles as well.
On the first page, you'll see what the finished components look like, on the second page, I describe some steps of the process.
I've restored the entire bodywork, especially the components in the underbody and engine compartment.
I think that's also your goal. I'm not sure how it looks with your Celica from the T18 model, but with the T23, individual rubbers weren't available anymore, only complete with the arms, at least not from Toyota. I think it will be similar with the T18, maybe even more difficult because the car is now so old that you can't get anything anymore.
https://www.celica-community.de/threads/restaurierung-t23.35428/page-2#post-441071
I wish you much success with your project and if you have any questions just write!