i replaced my alternater and battery and my car wont start and it drained my bat

If your battery is getting drained you have a parasitic draw somewhere. This is when an electrical component stays on even though the car is off. When you close all your doors make sure there isn't a light, radio, climate screen etc staying on. Past that an electrical mechanic will need to perform a draw test and pinpoint the drain. Here is a link to find a shop near you. https://repairpal.com/repair-shops Alex