1. Need pure copper
cat5 wire (no copper clad wire crap)
2. 99% of bad cameras are from operator deficiency (red tagged from operator deficiency is bad) READ, READ, READ
3. Find a hikvision camera and get it running... plenty of help in the forums to set up and run. Bleed that knowledge into Huisun cameras.
4. READ, READ, READ some more.
I promise after you get the 1st hik camera set-up... every other camera will seem very easy to set up... starting with any ptz is very difficult for most. Pick a hik 2032 to start.. very easy and get the hang of port-forwarding too. (buy from a local shop to give you help 1st.... then maybe you can buy from China later.