Request for the recommended standard scanning parameters

I have only used the HCP database for dMRI analysis before. Now I need to collect my own data, so I would like to ask for advice on the current standard Diffusion MRI scan parameters. The expected scan time is approximately 10-15 minutes.

Do I need to scan two runs? AP and PA。
The regions of interest are focused on the frontal lobe and the default network.

The scanning machine is a 3T prisma mri.