That means RouterOS 6.x, you should upgrade to latest 6.49.19, then you want "bridge" (or ap-bridge, see which is available) mode on the AP and "station-bridge" on the station.
"bridge" and "station-bridge" are the two modes that allow "full" L2 connection and should be the preferred choice where available for a "wireless wire" kind of link, it is how devices sold as "preconfigured pairs" are set.
Both devices will essentially be a "dumb" switch (but actually managed if you need) so they could do without an "own" IP (if for management you connect via Winbox MAC) or anyway (usually) a static IP address for management only.
You don't want a DHCP server on either device as the "main" DHCP server on your network will "pass through" them, but you can have a DHCP client on them if you don't want to assign to them static IP addresses.
Here is a basic step by step and configuration (to be adapted to your device ports and frequency):
Or this with some Winbox screenshots:
https://scoop.co.za/blog/how-to-create-a-mikrotik-ptp-bridge-link
That also need to be adapted were you to choose nv2 or 802.11, do read this:
you could probably use also WDS mode, but it shouldn't make a difference in your case where both devices are Miktrotik.