What is a good temp range for seedlings from day 1-14?

Also would like to know how long I can keep a dome over plants... Humidity is very very low where I live. How important is humidity at this stage?

humidity much more important than temp, think 70's for both

i concur

75-80 with your humidity dome on for the 1st 3 days. Start at 100% humidity & drop to 70% by removing the dome.