This is a too broad question! However, the following steps could be helpful. 1° Search prior art to find out if you have an invention: Espacenet or Patentscope are useful tools, 2° Determine the features of your invention in relation to the prior art, 3° Decide which countries you would like to protect (national, regional and international); this is dependent of a) the costs, b) your market strategy, c) infringement risks, 4° Choose a patent attorney to write the patent text, 5° When starting with a 'rather' small first national patent application (= priority filing), you still have one year to extend your protection to other countries.
Directly go to pct.wipo.int and follow steps there. That site belongs to WIPO, a United Nations organization.
The site will give you a template to fill. You should follow steps there. After explaining each and every step, upload your application and pay fees via credit card.
Or, if you have funds, consult a patent attorney.
Feel free to ask your questions, if any.
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