Plumbing pipe questions

[Funky_Fish14]

I cannot answer on the threaded connections, however I think I can answer the rest.

Yes, the white PVC is just fine to use. The glues to use(first) apply "Oatey" Purple Primer(well, its the only purple primer "Oatey" makes, not sure if thats the exact name), and "Oatey" Grey PVC Glue/cement(if I remember correctly).

I think threated connections are typically avoided, besides Union Couplers for easy dissasembly of the plumbing.

I hope this helps.

Take care,

Chris