No power at all, help with wiring please

First thing I did when starting to work on the car, right after the fusible link burnt. Because I could not find the proper rating on the wire and on the packages, I replaced the fusible link with a 30 amp in-line fuse. Which I proceeded to blow at least 25 times during the rewiring of the car.
I continue to use that as I still am totally confused about the proper fusible link to purchase