Try to keep the temp between 70-80 degrees F. And humidity isn't that big of a deal until flowering unless it is so high that you have standing water, or a lot of condensation buildup...if the humidity is that high then you can get all manner of mold and mildew and fungi...but just normal room feeling humidity is alright in veg...you want it a little lower in flower to avoid bud rot, but I don't keep a check on my humidity, so I am assuming it is alright...lol.
Another great thing to think about as one of the most important things for the first 4 weeks is the type of soil you will use...I use Fox Farms Ocean Forest or Roots Organic...both of them will feed for 2 weeks - a month without you ever having to think about feeding them so that takes away a lot of my anxiety when starting plants of many types. I prefer FFOF myself, but Roots is just as good I think..you have to feed earlier with the Roots though.