First, I'd recommend getting comfortable in HazRES before doing CZ.
Cannons are garbage, seekers are weak. You'd be better off with MCs/Rails for the Mediums. If you're not all that skilled at combat, an FDL isn't gonna be great. You'd be better off with a Krait II.
This ^
Ok I am doing conflict zones in solo and I am nearly always getting my butt kicked every time.
My Epic Alt used this Krait Mk2, totally unengineered
The trick is never to engage enemies alone. Stay near the green pack, see what they're attacking and help them, but only after their shields are down
IF you somehow get some attention, just dont fight back. Just make sure you are near the green pack, help them kill their current target and they will turn on the one attacking you.