Congratz! I've had mine for about 45 days and love it.
Apps? InstaWeather watchfaces. Wear Buddy so I don't lose my phone (since I don't have to have it in my pocket always). Wear Mini Launcher (ez access to watch apps). Wear Battery Stats - one of my favorites that let's me see if I should charge up my phone before the evening (after work).
Tip-if you drive a lot, put your watch in theater mode so you don't drain your battery... Because it blinks-on every time you raise your arm!
Tip #2 - use this forum
Tip #3 - lower your screen brightness to 1...IMO. You can go even lower with Wear Mini Launcher!
Best of luck and may your battery last you a full day!!