ldarko218

You cannot just combine formulas from newtonian physics and (special) relativity.

Lately I've taken an increasing interest in Physics and was wondering if there's any recommended starting points to learn as a base before moving onto a more specific field, perhaps some good books explaining the fundamentals?

Try reading "Fundamentals of physics" by Halliday, Resnick and Walker.

It has about 1,300 pages and covers everything from measurment in physics to special relativity.