Larry's recommendation is great.
Note that you'd be using InDesign to import your Word document into InDesign, and then use InDesign's toolset to tweak it to perfection. Depending on what tools you used in Word (WordArt? Cross-references? Footnotes?) the import may look almost identical to your Word doc, or it may be damaged beyond recognition. There is no "conversion" as such. I think that this worth saying to a novice, because you will actually need to learn a fair bit about how ID works, and it's a a steep learning curve.