I buy parts from Home Depot. The main line is 1/2 inch tubing which I run through the garden and either add mini-sprinklers or drippers. You can get distance from the main line with 1/4 inch line. I converted sprinklers to drip so can use the built in timers on the irrigation box. If running from a faucet, find a timer that hooks to the hose bib and into the drip line. DIG is my favorite timer brand. The one sold at HD stops working on the first hot day - just when you need it.
Here are a couple photos:
This timer is in my greenhouse
Photos of the drip line running through the plants. Eventually, the plants get big enough to hide the drip line or you can bury them. I water 10 minutes at a time 3 times a week. I live in the high desert - the soil is gritty sand so I have dug in a lot of compost.