2. Open settings => Wireless Networks => Create
3. Select Security: Open, tick Guest Policy checkbox,
tick Use VLAN ID and for example put 200 for VLAN ID, click Create
4. Now open WinBox for Mikrotik setup
for my simple setup i've created bridge bridge1 for LAN, with this parameters:
0 R name="bridge1" mtu=1500 l2mtu=1520 arp=enabled
mac-address=00:0C:42:A7:68:EC protocol-mode=none priority=0x8000
auto-mac=yes admin-mac=00:00:00:00:00:00 max-message-age=20s
forward-delay=15s transmit-hold-count=6 ageing-time=5m