3860 switch confused on port allocation

Hi
I have just purchased some WS-C3850-12S switches ..... i am trying to create a number of straightforward 1 gig uplinks from 2960 switches using fibre and sfps.
I am confused which ports i am suposed to configure the trunks on as the sh runn shows the below when i plug sfps into port 1/0/1 and 1/02 ......
Ive read up a bit - is it that if i want 1 gigabit ethernet i configure port 1/1/1 and if i want ten gig i configure port 1/1/1 and 1/1/2 ...why two ports for ten gig are these port-channels to make 10 gig ......or am i just losing the plot ?
be great if someone hasa 2960 with trunk port and an sfp iplinking to one of these to send a basic config
Any help appreciated as the internet is not littered with examples :)
many thanks
interface GigabitEthernet1/0/1
interface GigabitEthernet1/0/2
interface GigabitEthernet1/1/1
description Link core to building A
switchport trunk allowed vlan 10-15,20-22
switchport mode trunk
interface GigabitEthernet1/1/2
interface TenGigabitEthernet1/1/1
interface TenGigabitEthernet1/1/2
interface TenGigabitEthernet1/1/3
interface TenGigabitEthernet1/1/4

hi evryone - got thsi working would you belive i had two duff pairs of fibres
still appreciate an answer to my 10 gig question ...why does the switch have 1/1/1 and 1/1/2 ?
ta

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# Do not remove the following line, or various programs
# that require network functionality will fail.
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NETWORKING_IPV6=no
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*filter
:INPUT ACCEPT [425:33860]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [307:40164]
COMMIT
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eth0      Link encap:Ethernet HWaddr 52:54:00:55:9B:C9
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I have a Cisco ACE 4710 configured in One-Arm mode. This ACE is getting connected with 2 3750 switches. These 2 3750 switches connected in trunk mode.
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================================
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3860 switch confused on port allocation

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