Setup 1941 router with cable modem and 2 vlan?

hello everyone,
i need a little help setting up my new 1941 router with cable modem using 2 vlns.
this is what i have:
1- 1941 router configured as g0/0 wan port facing isp configured as (dhcp). g0/1 is lan facing the switch (192.168.1.1)
dhcp pool (192.168.1.x)
2- sg300-28pp switch.
3- wap371 AP/ 11pcs..
now everything is working perfect except sometimes we have more than 250 to 300 people trying to connect to the wifi, the router will have no enough ip addresses.
i heard that i can setup 2 vlans to solve this problem? and is there any setup that i have to do on switch and Access points? 
please i will appreciate any little help 
Regards 

hello Andre Neethling  i added network 192.168.0.0 255.255.254.0 to dhcp pool config and it seems that it is working but i am concern that i am going to have problem in the future so please take a look at the running config and let me know if i have everything done right. also we want to order static ip address from the provider for our security camera system and we will not longer receive dhcp ip from them and my router setup is to receive it as dhcp on g0/0 so what i should do about changing the settings on g0/0?
i appreciate your help
Building configuration...
Current configuration : 1163 bytes
! Last configuration change at 00:46:35 UTC Wed Apr 15 2015
version 15.0
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname Abdullah
boot-start-marker
boot-end-marker
no aaa new-model
no ipv6 cef
ip source-route
ip cef
ip dhcp excluded-address 192.168.1.1 192.168.1.50
ip dhcp pool Local
   import all
   network 192.168.0.0 255.255.254.0
   default-router 192.168.1.1
multilink bundle-name authenticated
license udi pid CISCO1941/K9 sn FTX1523022E
redundancy
interface GigabitEthernet0/0
 ip address dhcp
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
interface GigabitEthernet0/1
 ip address 192.168.1.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
 duplex auto
 speed auto
ip forward-protocol nd
no ip http server
no ip http secure-server
ip nat inside source list 101 interface GigabitEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0
access-list 101 permit ip 192.168.1.0 0.0.0.255 any
control-plane
line con 0
line aux 0
line vty 0 4
 login
scheduler allocate 20000 1000
end

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