It rarely happens to find valuable tips about processing on the web. When it happens, it's probably not enough to bookmark the page (it may disappear), copying it is a better idea. Here is the link:
When you arrive there, scroll down until you find the chapter Some General Tips About Spectral Processing.
The focus is on multi-dimensional processing with NMRPipe, but a few concepts are generally applicable indeed.
The brief discussion about first-point pre-multiplication is something to bear in mind. You can also find clearly expressed opinions on zero-filling, linear prediction and baseline correction.