Starting Long-Term Investing with ETFs – Need Advice!

I'm planning to start investing with a long-term horizon (minimum 10 years) and will be following the DCA strategy. After some research, I’ve filtered out these 3 ETFs for my portfolio: Nippon India ETF Nifty 50 BeEs – 40% Motilal Nasdaq-100 ETF – 40% Nippon Midcap 150 ETF – 20% I’ve decided to use ETFs instead of mutual funds because they have lower fees, and I prefer index investing. Would love to hear your thoughts!