active directory - Build new domain server 2012 in parallel with existing windows domain server 2003

I have existing network with around 400 PCs on it working
under windows xp professional and windows 7 professional too.

Around
375 PCs are linked using static IP address and they are not connected to any domain
server and only around 25 PCs are Linked to an existing domain server exist on the
network working under windows server 2003 be cause of project
that is stopped 5 years ago and no one control what happen on it and know nothing about
it so as you can see their not much think to lose.

Now I want to make new domain server

but using Windows Server 2012 R2

I have installed Windows Server 2012 R2 and I am planning to activate the active direcory,DHCP, and
DNS
while these small number of PCs which are linked
to the OLD windows domain server 2003 are ruining and I want to touch them for now since they are belong to
high level employees.

I want to slowly move all
other PCs which are not connected to any domain server yet to join one by one with slow
steps to the new domain server.

my
question is

is their any conflict may happens
in mt case ? if yes what is it and how I can avoid it to shift all PCs to new doamin
server and keep those small number for the last step
??

if there is any advices or think you can help
me with I will really appricicate since I will bulid that from the scrch

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