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Printing Cards
You primarily have two choices when it comes to printing cards (community set or otherwise). The first, cheapest, and easiest option is to print them on your home printer or at a office supply store like Staples. If you want something more substantial but costs more, you can also get them professionaly on card stock.

At Home & Office Printing
If you want physical copies of the cards right now and quality doesn't matter, print them on your home printer. The easiest option would be to download the cards as a single PDF without bleed. Once all printed, take some scissors and spend some time cutting them out.

If you want something a little nicer but still very affordable, then you can print them at a place like Staples or Office Depot. I personally haven't printed at Staples before, but I have used Office Depot many times and I imagine the setup and outcome is very similar.

First, download the set(s) you want to print as a single PDF without bleed. I like to use their 100lb &Gloss cover premium white& paper. Make sure "Keep Size" is selected, you don't want them to scale this down at all. Once printed and cut out, sleeve the battle cards over an existing card (like Zap or something) it'll look very much like a real card. For the character cards, they're laid out as such that you should be able to glue their pages back-to-back and then cut.

Professional Printing
If you wish to have copies that feel and handle like the real deal, then you'll need to get them professionally printed. Brian Alan a good post on Facebook about this which is quoted below. You can read the full discussion on Facebook thread discussing printing options.

Written by Brian Alan
I just ran some rough numbers on getting two of the larger fan sets printed at MakePlayingCards and here's what I came up with:
-Getting roughly 24 character-sized cards (3.5" x 5") and 164ish to 240ish battle cards/small characters/strat-sized cards (2.5" x 3.5") should be about $60-$75ish, with shipping probably running you about $20 on top of that, possibly more if you're not in the US.
-If someone is charging you $80+ish and you're not getting 150+ cards, you're getting suckered.
-You can bring that cost down significantly by partnering with other local or even local-ish people who may be interested (discount on buying multiples and saving on shipping).
-If you don't mind paying a LITTLE extra, you can also get your small characters and strats with holofoil on one side.
-There's not a cost-effective option right now to have MPC do a holofoil side on 3.5" x 5" cards. I emailed them to check on the cost and it's pretty ridonk ($95 for a deck of 84 regular character-sized cards).
-They don't print Titan-sized cards. I might just recommend ordering two matte (not glossy) 6" x 8" photos and putting them back to back in a sleeve/top loader.
Dave at Energon Hustlers did a fantastic tutorial on how to use MPC that you should definitely consider checking out: https://youtu.be/QLiw_JlNqx8

Additionally, Energon Hustlers has a good video on using MakePlayingCards.