A banner is the only print most people ever buy that has to survive weather. It is also the only print judged from thirty metres away by someone driving past. Both facts change the buying decision, and neither is obvious the first time, which is why so many first banners arrive with beautiful detail nobody will ever stand close enough to read.
Large-format work is read at range, and range is brutal about detail. A rule of thumb signmakers use: text needs roughly 25mm of letter height for every ten metres of reading distance, so a banner read across a car park wants letters several times taller than feels natural on screen. The discipline that follows is subtraction. A strong banner carries one message, a name and a reason to care, in huge type with real contrast against the background. The paragraph about your company history is invisible at distance and clutter up close; move it to the leaflet, where it belongs.
The jargon on a signage quote mostly describes materials, and the choice follows from where the thing will live. PVC banner material is the outdoor workhorse: hemmed edges, metal eyelets, cable-tied to railings or scaffolding. Rigid boards, foamex and its relatives, suit walls, hoardings and anything that must look flat and stay flat. Roller banners are the indoor self-standing units that travel to exhibitions in a bag. Self-adhesive vinyl turns windows and vehicles into signage. Tell the printer where the sign will go, indoors or out, sheltered or exposed, one weekend or five years, and let them name the material; that is their expertise, and guessing it yourself is how banners end up flapping in ribbons by February.
The commonest large-format disappointment has nothing to do with printing: the sign arrives and there is no plan for putting it up. Decide before ordering how the thing attaches, eyelets and ties, poles and a frame, screws into masonry, and who is doing the attaching. Wind is the other half of that conversation, because a solid banner on a fence is a sail, and exposed sites sometimes want mesh material that lets gusts through. A supplier who asks about your site and your fixings before quoting is showing you they have seen the failures.
File setup scares first-time buyers more than it should. Photographs that look sharp on a phone screen can turn soft when blown up to two metres, so use the largest original you have. Logos supplied as vector files scale to any size without loss, which is why signmakers keep asking for them. If that sentence is already too technical, send the printer whatever you have and ask; checking artwork is a normal part of the job, and any decent firm would rather fix a file than print a blurry banner.
Large-format is its own corner of the trade, with different machines and materials from the firm that prints your leaflets. Among the 2,868 printing companies listed on this site, a good number are signage and display specialists. Browse the firms near you and look for large-format or signage in the listing, or describe the sign, the site and the deadline and gather quotes. Before you contact anyone, stand where your audience will stand and pace out the reading distance. That one measurement will shape the size, the type and the whole design better than an afternoon of browsing templates.