The "wings" support the strip of film, more or less, they are intended to support a full roll. Most people will cut the negative strip so that there are only 5 or 6 frames (in the case of 35 mm), so the wings don't do much in that case.
Since you have a lens mounted, you probably don't need a lens board (that is, you presumably already have one). If the lens has different threading than what is currently common, you may need some sort of generic adaptor though, if you're looking to change from what's there. If the glass is in good condition, you can start off with what you have reasonably enough, however.
Negative carriers built for other enlargers can often be adapted or you could fabricate something with materials like foam core and mat board. (or wood, or metal depending on your skills and equipment you may have available). 3d printing might also be a solution.