arch linux: failed to start DCHP (read to the end, I SORTA know what i'm doing).

I just installed Arch linux, but could not enable networking. First, I tried to run the Wifi-Menu command, but it didn't work (Wifi-Menu: command not found). I couldn't find the network manager on the plasma desktop, so I looked on the arch linux wiki. I tried running systemctl enable dchpcd@wlp6s0.service (my wifi card), but I was denied access to systemctl. SOMEHOW, the sudo command wasn't installed, so I ran Su. now, as root, i ran the command again, and it must have worked. Except somehow it didn't, as when I ran systemctl list-unit-files, dchpcd@wlp6s0.service was listed as "failed". I looked even further and found that dchpcd was at "blocked" status. I tried enabling it, but I got another bash prompt. I tried many times, but it didn't work. I couldn't take it anymore, so I ran systemctl enable NetworkManager.service, and it worked. the network manager appeared on the system tray. I opened it and connected to my wireless network, but almost immediatly the notification center was full with messages that read: could not connect to wlp6s0, failed to start DHCP. I repeatedly tried to enable Dhcpcd and dchpcd@, but I kept getting more bash prompts in return. How do I enable dhcpcd if I only get bash prompts in return? Does anyone know what is going on?