IT is a very competitive field. Many people start in a support type role where you work on issues reported by users, investigate them, and fix them. This could be issues with their PC, email issues or more specific applications (e.g. in the case of a bank you might be working on tickets for internet banking, trading systems, etc). Many other people start as junior programmers and the field is quite wide. There are many languages and many different types of programming from application development to web development, etc . As has been mentioned Python is a good language to start with. But both of those routes are highly competitive.
Security, which you've mentioned, is a good niche. I don't personally know how to get started in that direction as it's not a field I have worked in. But a good understanding of operating systems and applications would be beneficial. So working in either a support or programming role may of use here, although others with more specific Security knowledge will be better able to advise.
Although "getting into IT" can be difficult simply due to how competitive it is, you do have an advantage. You already have business domain knowledge in fast food, warehousing and sport/football. So one suggestion may be to see whether your current company has any IT department and see if there are vacancies for any role there. If not then look for junior roles in those domains. For example searching for jobs for infrastructure support for sports clubs, sports companies, betting companies, etc. That way you still get to enjoy your love of sport indirectly, you move into an IT role and have business domain experience to help as an advantage over other applicants.
