firewall - Inside Users can´t reach the DMZ, as well as outside from my cisco ASA 5520 v.7

I'm configuring my Cisco ASA 5520 version 7 and below is the show run of the machine:

ASA2>
ASA2> en

Password:
ASA2# sh run
: Saved
: ASA Version 7.0(8)
! hostname xxxxxxxxxx
domain-name parlamento.ao
enable password xxxxxxxxxx encrypted
passwd xxxxxxxxxxx encrypted
names
dns-guard

! interface GigabitEthernet0/0
description "Link-To-GW-Router"
nameif outside
security-level 0
ip address 41.223.156.109 255.255.255.248
! interface GigabitEthernet0/1
description Link To Local Lan
nameif inside
security-level 100
ip address 10.1.4.1 255.255.252.0

! interface GigabitEthernet0/2
description "Link-T
nameif dmz
security-level 50
ip address 172.16.16.1 255.255.255.0
! interface GigabitEthernet0/3
shutdown
no nameif
no security-level
no ip address

! interface Management0/0
shutdown
no nameif
no security-level
no ip address
! ftp mode passive
access-list OUTSIDE-IN extended permit tcp any host 100.1.1.1 eq smtp 

access-list OUTSIDE-IN extended permit tcp any host 100.1.1.2 eq www


access-list DMZ-IN extended deny ip any any log

access-list DMZ_IN extended permit ip any any
pager lines 24
mtu outside 1500
mtu inside 1500
mtu dmz 1500
no failover
asdm image disk0:/asdm-508.bin
no asdm history enable

arp timeout 14400
global (outside) 1 100.1.1.2-100.1.1.254 netmask 255.255.255.0

nat (inside) 1 10.1.4.0 255.255.252.0
static (dmz,outside) 100.1.1.1 172.16.16.25 netmask 255.255.255.255

static (dmz,outside) 100.1.1.2 172.16.16.80 netmask 255.255.255.255

access-group OUTSIDE-IN in interface outside
access-group DMZ-IN in interface dmz

route outside 0.0.0.0 0.0.0.0 41.223.156.108 1

timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00
timeout mgcp-pat 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
username tchipa password JUU.kVt2Und.Vd23 encrypted privilege 15
http server enable
http 10.1.4.0 255.255.252.0 inside

no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
! class-map inspection_default
match default-inspection-traffic

! ! policy-map global_policy
class inspection_default
inspect dns maximum-length 512
inspect ftp
inspect h323 h225
inspect h323 ras
inspect netbios
inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp inspect icmp inspect snmp ! service-policy global_policy global Cryptochecksum:449d5f1c3c31ec4623e58887720e339b : end

The Problem is;

At the moment, from the inside network, I can't reach or ping the DMZ. By this I mean the .1 or .25 or .80, and once the machine is running, from the inside network I can't even access the Internet as well as from Outside. I can't reach my and DMZ. But from the ASA I can ping both the pc 10.1.4.2 on the inside network (10.1.4.1), and the pc 172.6.16.25 on the DMZ(172.16.16.1)

What I want:

1. Allow my inside PCs to access the Internet.




2. Allow outside traffic or internet users to to access my DMZ; specifically my email server 172.16.16.25 and webserver 172.16.16.80




3. Static NAT with my web and email servers





4. Allowing inside users to access my DMZ specifically on my email server 172.16.16.25 and webserver 172.16.16.80

That's basically what I need to have the machine up running.

Can anyone please give me a straight forward inputs or command to help me solve this problem please.

I thank you in advance once again... and hope my ASA sh run this time looks much more clear.