Because your invention lies in the combination of two processes, and the invention mainly lies in the process flow, it is better to apply for an invention. However, if you apply for an invention, the examiner will evaluate the creativity of your invention. For example, if the effect of the first step is 1 and the effect of the second step is 1, then the beneficial effect of your invention must be 1+ 1 & 2 before it can be authorized. . .
There are generally two ways to apply for a patent in other countries: one is PCT application, that is, applying to other countries through the State Patent Office; The second is the Paris Convention, which is applied to other countries through the offices of other countries.
The details are complicated. I suggest you find a professional organization to do it for you. Hope to adopt. . .