Hi tiagotoledo, as you have installed a fresh new epo server then you just only need to deploy McAfee Agent to your computers (i would use 4.6 or 4.8) as if they were unmanaged and they will report to your epo as usual
McAfee support article: KB66892 - How to redirect the communication of McAfee Agent 4.x to a new ePO 4.x server should still apply to ePO 5.0 too, and MA 4.5 agents are still supported with ePO 5.0 according to the user guide.
You may need later agent versions for specific point-product support down the line, so upgrading MA to 4.6 or preferably 4.8 is still a very good idea.
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