For a basic AP, this is all you need:
# apr/13/2016 12:27:53 by RouterOS 6.34.4
# software id = UIZV-RX3X
#
/interface bridge
add auto-mac=yes name=bridge1
/interface wireless
set [ find default-name=wlan1 ] band=2ghz-b/g/n channel-width=20/40mhz-Ce \
disabled=no distance=indoors max-station-count=50 mode=ap-bridge \
radio-name=AP1 ssid=FREEWIFI wireless-protocol=802.11
/interface ethernet
set [ find default-name=ether2 ] master-port=ether1
set [ find default-name=ether3 ] master-port=ether1
set [ find default-name=ether4 ] master-port=ether1
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa-psk,wpa2-psk eap-methods="" \
mode=dynamic-keys wpa-pre-shared-key=awesome wpa2-pre-shared-key=\
awesome
/interface bridge port
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=wlan1
/ip dhcp-client
add default-route-distance=0 dhcp-options=hostname,clientid disabled=no \
interface=bridge1
/system identity
set name="WIFI AP 1"
Start from a no-default configuration, import the above and you're good to go. If you prefer, you can remove the DHCP client and assign an IP address to it. Of course, change the variables to your liking.