Was told it was a Sunday bmx 20" just don't know the year, so how will I know how to order the proper parts?
Serial number is wtu148p048e.
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Contrary to seemingly popular belief there is no giant database of bike serial numbers, manufacturers, models and original components that people with sufficient reputation on Bicycle Stack Exchange magically have access to.
If you want to build a bike up from a frame you simply have to learn about the various standards and sizes of wheels and hubs, bottom brackets and cranks, seatpost diameters, head set bearings and steerer tube diameters, brake mountings etc etc etc.
Additionally, for any bike there is a vast selection of different components available. You will get to make a lot of choices about style, cost, weight and quality.
The Park Tool Company articles and YouTube Channel are my favorite resources. They focus on current road and mountain bikes and don't have much BMX specific content. A great deal will be applicable to BMX bikes though.