How to set up VLAN for DATA and VOIP on SRW248G4P switch?

Hi guys,
I am totally new and was given this task to complete. I  really really need help.
We are using one network 192.168.1.0
Shared  with data and voip.
CISCO C870, 5 switches LINKSYS SRW248G4P .
The  email wrote:-
On the Linksys switch;
- create two  different VLANs one for voice and one for data.
- put a firewall  between the two VLANs (between voice and data) and only enable certain  ports to flow to voice network (inbound tcp 8443 and ssh )
What  should i do guys? I really need a dumb guide now.
I know its simple for  you guys but i am not a smart IT fella. Whats the  step by step?

If the switch is new or you have support on this, then you might try calling the support center.  Here is a link:
https://www.myciscocommunity.com/community/smallbizsupport
On the right hand side you can find links to the support center.
Here is a link to the guide:
http://www.cisco.com/en/US/products/ps9967/prod_maintenance_guides_list.html
@ the bottom of this link you can find your switch model, you want the larger of the two.  In this guide it shows you how to create a second vlan.
Will your router be the firewall between the two?
Kindest regards,
Andrew Lissitz

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