DISCLAIMER: Ignore this step if you already have friends.
First you're going to need to get some friends. Friends are a rare thing in today's world but if you follow this step carefully you might be able to get some. Step 1. (Of step 1) Either go to a park or join a popular discord server, either will do. Step 2. talk to someone. Step 3. ask if they have steam. Step 4. If they say no, leave and don't say anything; if they say yes then proceed to friend them on steam (if they have discord or a way to vc with them then this guide will be made a lot easier). Anyways now you have a friend you can proceed to step 2

Quite simple, just launch the game and host a private match :/

If you are hosting the server set it so only weapons your confident with spawn (esc/ game options/ weapons) and set the maps to ones that you are good on (esc/ game options/ maps). if you aren't then try your best to shred them to tiny pieces.

losing friends is an important skill in life so i hope you now understand the basics of the process.