Best Allocation of ETFs that also include dividend ETFs

Background: Hello I am 26 y/o in the US with a decent salary. I invest about $750 a month in broad market ETFs in my Roth IRA. The $750 I invest is after investing in my employers 401k upto the match. I want to start investing a little amount into dividend ETFs like $SCHD or $VIG. My question is what allocation % would/should someone my age put into dividend ETFs. I am adamant about starting the snowball effect of dividends ETFs. I am unsure what allocation % I should follow so would like to see