Everything takes practice, especially items that most are unfamiliar with. Dip-pens are one of those things that take a while to get the hang of. Try some nibs for sketching, also be wary of the sort of paper you're using. As a beginner, you run the risk of scratching your paper and clogging the nib. It takes much more practice to work with dip pens, so if you want to use them, set aside time to get your work up to par before actual production. Once you're familiar with it, it's like nothing. Until then, you have to learn how much pressure to use, how to time your ink dips and how to avoid blots. It's tough but no more tough than learning the screen-hand coordination it takes for drawing with a tablet.
Also, you can buy replacement nibs easily with cheap shipping online, if shipping is too high on the product site, try ebay and amazon. I got a set of replacement nibs for $5 total, this was including shipping, rather than $5 + shipping. You get several digital-nibs for the cost it would take for you to start a new quill-nib collection. If even that is too much of a hassle, ball point pens are readily available. Heck, you can just go around asking if someone can spare a pen and you'll end up with one that's of decent quality. Gel pens and ballpoints do great work as ink and shading pens, so weigh your options.
On that note, I really suggest that you as an artist and a person start weighing your options before diving into things. Comics and art in general are not profitable pursuits, and if you're ready to give up after a little bump, then don't start in the first place. If you're ready to drop your entire artistic journey because you can't spare $5 for a new nib, or do as many have suggested and found a ballpoint on the street then you're better off pursuing other things. You may be good at writing, you may be good at drawing, but talent only does so much.