Memory: your choice (do not enable dynamic memory)
Processor: your choice, benefits above 2 may not be seen depending on workload
IDE Controller: Hard Drive: Select the vhdx created before
Network Adapter: How you configure these is up to you, but you should create at least 2 (one for WAN one for LAN). If you only create 1, it will be assigned to LAN. The last port created will always be assigned to WAN (if > 1).