Start simple corroded battery cables are trouble. There is no such thing as a "little corroded". The battery terminal ends that are sold are merely "band-aids" the exposed copper part of the cable will still oxidize or corrode even under the insulation. Clean corrosion, check condition of cables, and connections first. Have battery and charging system checked. Many parts stores will do it for free, however bad cables can "skew" results.
It will be OK