It's best to use a really good capture device. The one I use has RCA in, but here is a good one with XLR. http://www.sweetwater.com/store/detail/QuadCapture?adpos=1o2&creative=55225946401&device=c&matchtype=&network=g&gclid=CIn0u8X42sMCFRNafgodB0UAdg
The most important thing to getting a really good capture off an LP record is to make sure your level is set properly. It's a good idea to have an adjustable preamp between your turntable and the capture device so you can adjust the line level to avoid clipping, or to be so low in level that the noise floor is raised. (Remember, you always need a turntable pre too to apply the RIAA curve.) Capture to your computer using a program like BIAS Peak.
Once you have captured the track, there are three kinds of noise reduction you can use. Some are very good, and others are very bad.
Broad Band Noise Reduction: This is the bad one. This basically applies a muffling filter over the top end. You want to avoid this one.
Dynamic Pattern Based Noise Reduction: Used with discretion, this can be helpful to reduce surface noise. The filter analyzes a silent section between tracks and determines the frequencies where the surface noise and rumble resides. Then you can adjust it to roll in based on the dynamics of the music- higher in silent passages, out completely once the music is loud enough to mask the surface noise. It can take a little trial and error and experience to know how to use this. A good example of this sort of filter is SoundSoap 4.
Impulse Noise Reduction: This is the most useful form of NR for LPs. It senses sharp transient clicks and pops, and applies a filter only to the fraction of a second where the noise occurs. It analyzes the sound before and after the click to create pink noise that bridges the gap perfectly. Since the noise reduction is only applied to the tiny sliver of time where pops and clicks occur, and the filtration is completely disengaged the rest of the time, it can only help the sound quality, it can't hurt it.
Once you have finished applying NR, normalize your track up to about 90% and listen to it. You might want to apply some judicious equalization. Often LPs had high and low end rolloffs to accommodate tracking and record wear problems. Sometimes a little sub bass and upper frequency boost can help freshen up an LP transfer.