This is a list of steps to start using LaTex today. All you need are 2 hours and a personal computer.
Read an introduction about LaTex (maybe this one).
Decide what will you start using LaTex for (to write my next article, for example, or to create presentations).
Use the previous decision to stick to a document class (article, book, beamer…). Choose a template project that looks similar to what you want to do and whose code seems simple at the same time.
Start using Overleaf, an easy to use, online, collaborative editor. Overleaf will make it simple to start without installing anything, and continue your project whether your working at home or at work. You can choose one of their templates to accomplish the previous step.
At all moments, keep a good reference to remember the typical commands. Wikibooks offers a great online guide that serves both for learning and as a quick reference.
For more complex things, browse the internet. You can find useful answers (or write your own questions) at tex.stackexchange.com.
Once you’ve spent a few months/weeks using Overleaf, you may want to switch to an offline installation. You will need to search on how to install an integrated editing environment for LaTex (like Kile). Alternatively, install the LaTex resources package tex-live, use your preferred editor to write LaTex and a terminal to compile (the workflow I prefer).