In our tutorials for creating your own custom Stellar tokens we use the stellar.army website. It makes your life a lot easier.
You are of course free to go setup Stellar tokens anyway you like - but we focus on stellar.army as an accessible way for beginners to get started.
Before you do this, you must have a Stellar wallet created that has been funded with Lumens!
Adding your account
Browse to stellar.army and click the PLUS + icon in the top left
Choose "ADD EXISTING ACCOUNT"
Then provide 1. a friendly name for your wallet and 2. your private key
Click "ADD ACCOUNT" to see your wallet on the Stellar.army dashboard. You can now create a new token.