2 ETF Portfolio

I am new to trading and investing. After doing some research, I am going to go with SCHD $Schwab US Dividend Equity ETF (SCHD.US)$ and SCHG $Schwab Strategic Tr Us Large-Cap Growth Etf (SCHG.US)$ 50/50. My goal is to retire in about 15 years, so I'll be dropping in money in these 2 etfs till then. Maybe some satellite etfs or single dividend stocks will be added, but I don't know how overlapping will affect what I have now. I am still young, so I will hopefully have enough time to grow my money. Any suggestions on what I should add to this later on or if it's good the way it is would be appreciated. Thanks.