aight dude this what you need

sound card:
I would get an m-audio sound card they are good for their price to, i would get the 100 dollar one.

Preamp:
you can go to your local music store or shop online for a preamp should be no more than 60 dollars

Turntable:
Dont get a overpriced turntable you just sampling, only thing i would spend the most on is the needle so you can get a good sample, you can always dirty the sample up in the comp.

Records:
anything any record, childrens records and crap just anything.

Software:
Don't know how much money you got but i would get cool edit pro, they changed the name but can't think of it right now but if your on a buget i would get Audicity if free and you can sample it in.

Next all you need is determination, and skill, don't stop keep at it.

Also I would look into a midi controller to if you ain't got one.