Design and create Vlans onflat network

Need to VLAN a flat network.  
I currently have a network and it is one large flat network with one subnet of 255.255.252.0 with a range of IP's 192.168.0.1 - 192.168.3.254.
All of my servers, routers firewalls, printers , copiers  and switches are within 192.168.1.1 - 192.168.1.254
My Workstations (Windows 10 )  are all receiving IP addresses from DHCP server and in the range of 192.168.2.50 - 192.168.2.250

I have been tasked with setting up vlan's for the entire network to improve security and performance

I currently have a 5 switches which are all 48 port switches and in  a stacked configuration with 40 GB uplink to a "Central" Switch. These 5 switches are considered our user segment which has workstations and Printers connected.

The Central switch is actually two 48 port switches that are stacked and have the Servers, routers and firewall connected.

my default gateway is a cisco Switch .

I'm looking for some guidance in multiple areas,
1. design ? how many Vlans , do I use vlan 1 ? I think my current configuration would mean everything is VLAN 1
2. Will I need to change my IP addressing of my enire network ? if so what would my new IP addressing look like. how would I g about changing without taking down the whole network.
3. Can the job be done slowly ?
4. Can a server ( DHCP ) on one Vlan provide IP Addresses toWorkstations on a separate Vlan ?

Thanks for any feedback
EkuskowskiAsked:
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atlas_shudderedSr. Network EngineerCommented:
1. design ? how many Vlans , do I use vlan 1 ? I think my current configuration would mean everything is VLAN 1:
Number of VLANs is generally dependent on the degree of segmentation you want to create.  Usually we place in Workstations, Wireless, Servers and Printers in separate vlans.  Further segmentation may be necessary dependent on needs.  If you are only running one vlan then yes, it is most likely all vlan 1.  No, it is generally recommended to move assets out of vlan 1.

2. Will I need to change my IP addressing of my enire network ? if so what would my new IP addressing look like. how would I g about changing without taking down the whole network.:
Any equipment not remaining in the current network will need to be re-IPed.  The 10k foot view is to build the new vlan and then migrate the devices in - would need more information to really answer the how.

3. Can the job be done slowly ?:
Reference back to 2, potentially but again, more information needed.

4. Can a server ( DHCP ) on one Vlan provide IP Addresses toWorkstations on a separate Vlan ?
Yes, this is accomplished with a helper address on the vlan SVI's in the switch or the gateway addresses of the individual vlans.

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EkuskowskiAuthor Commented:
Thank you,  I will talk to my team and use your information/recommendations  to move forward with our project
atlas_shudderedSr. Network EngineerCommented:
No worries   Good luck
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