Pictures would help..
Are you sure you need a new chainring and crankset?
Check what you have right now, the cheapest way may to reuse these components (should be easy, Fuji didn't use cottered I don't think)
1) Yes, go to your LBS if you can't figure it out yourself, I just grabbed a 110 square spindle cranketset (Bulletproof) at my used parts bike shop and its working great on my Raleigh Grand Prix, but find out what your spindle length is. The chainring will be specific to the crank. (Figure our your gear ratio before hand!)
2)Any freewheel cog will fit your hub (to the best of my knowledge)
3) Since all you need is a crankset (I'm assuming), Bulletproof (Origin8 now) works great for me, cheap and reliable (bought used). If you do get a new crankset, go for 165 or a similar size, as it will help your pedal strike problem due to a low BB height.
On the topic of cheap parts in a conversion, Velomine has good deals on wheelsets, Nashbar, Benscycle, Newgrounds, and Price Point have most common parts for a decent price.