They're not completely useless for blades...they're great for letter openers, oyster shuckers, etc. If you're looking for something that will hold a sharp edge, however, RR spikes just won't do it. If you just want to make something that looks good I've seen some beautiful knives made from spikes but if you want something that will hold an edge they're just not the right material.
As far as blowers go, I found an inexpensive electric blower on eBay for my forge (around $45 I think). My first blower was a $1 hair dryer I bought at a thrift store. My first anvil a piece of RR rail (no horn) and I still use my first forge which I made out of an old car wheel. It doesn't have to cost a fortune to get started in blacksmithing.
I've seen anvils made form RR rail, fork lift forks, large chunks of steel, etc . Forges made from plow discs, lawn mower frames, old sinks, etc. Blowers made from hair dryers, vacuum cleaners, etc.
There are lots of ways to "get started". Get started! and once you do you you will have a thousand more questions but you will also start to not only answer your own questions but to understand the answers from others a lot better. Just like everything "worth it", it takes time to be good and more importantly, it takes practice to be good.