So I'm lucky enough that there's a small company in Australia that has a monopoly on independent printing, ComicBooksOnDemand.com.au, because every comic maker will direct you to them and recommend them, and their process is really easy to understand. If you live here, I highly recommend them. If you're not in Australia I still have ways to translate this to your location!
Googling independent comic printers. Try to stick specifically to comics, because their paper, ink and prices will be aimed at this medium and it'll be better for you and your work. You don't need to find someone close by you - most services will take online orders and ship things out to you like CBOD.
Asking local comic groups. If you have a local shop, go in and ask if they deal with local creators, or if they know of any comic creator gatherings and groups. Sometimes you'll get lucky and find a meet up where people are happy to share their experiences! But if not, don't forget the magic of facebook. Try searching for "Comic creators [your city/town/state]" and request to join. Getting first hand recommendations and advice is the best way to start printing because you'll have real human folks to ask questions to if you get stuck.
Amazon Createspace. Not recommended unless you're desperate. They print books much like society6 or redbubble would - You upload the work, then they host the shop page, print it, and ship it out to people when folks buy it. I wouldn't recommend solely because it's mainly for books, you don't get control of your own storefront, and you only get paid by a cheque in the mail only after every $100 you've made. Rough.
I hope some of this helps! These are the first things that come to mind based on my own experiences so I hope other folks can add on
