MB - Look toward the B350 chipset and a board with four memory slots. Two for now, then two for an upgrade down the road.
MEM - Always install modules in matching pairs to take advantage of the dual memory controllers. A single module will have you in single channel mode (reduced performance).
PSU - The Corsiar CX model is pretty weak. Especially the 2015 model.... You get what you pay for here so don't go cheap!
PCPartPicker part list /
Price breakdown by merchant
CPU: AMD - Ryzen 3 1200 3.1GHz Quad-Core Processor (₹8100.00 @ Amazon India)
Motherboard: Gigabyte - GA-AB350-Gaming ATX AM4 Motherboard (₹5626.76 @ Amazon India)
Memory: G.Skill - Ripjaws 4 series 8GB (2 x 4GB) DDR4-2400 Memory (₹6225.00 @ Amazon India)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (₹3605.00 @ Amazon India)
Video Card: MSI - GeForce GTX 1050 Ti 4GB Video Card (₹13294.00 @ Amazon India)
Case: Corsair - 200R ATX Mid Tower Case (₹5400.00 @ Amazon India)
Power Supply: EVGA - SuperNOVA G2 550W 80+ Gold Certified Fully-Modular ATX Power Supply (₹5147.06 @ Amazon India)
Optical Drive: LG - GH24NSC0B DVD/CD Writer (₹1319.71 @ Amazon India)
Total: ₹48717.53