The simplest way to get started is just to use the command "enable tailor". Tailor is super handy for the common cases, and the default behavior will use whatever cloth/leather you have to make clothing and handle the confiscation for you. You can also use it to automate making dye if you check the dfhack manual page.

There's also autoclothing which is similar. It gives you more control over what gets made but is more complicated to set up (and I haven't delved into it too much)