First grow

Nope, it's good! A lot of plants start with odd leaves. 2 of the 3 I have going now had funny shapes and curves in the first sets of leaves, but they grow out of it. Don't overwater and don't feed any nutes yet and she will be just fine!

This is a topic that causes some division, some growers have a good reason to use it only in the first half of veg, others have a good reason to say that it should be used only in the last half of veg. I'm in the middle, i say use it all the way thru veg, just start out small due to the size of your seedling, you don't want to over-do it, and if you do it just right you may speed up the growing process and grow a more resistant plant, because a strong root= a strong plant. Hope it helped.

I like to top as soon as it gets it first 7 fingered leaves. I suppose you can do it right after a set of 5 also, but I worry about stunting them.

Water the right ammount of water. Let her catch as much sun as possible. Before night time put a doom over the pot to protect from wind and to build up more humidity, you can leave it during the day but only if the sun is not too strong or you will risk cooking it. Gl growmie and stay lit.

Yeah, you need the meters. Ec vales are: 0.8-1.3 for seedlings; 0.5-1.3 for clones; 1.3-1.7 under vegetative phase; 1.2-2 during flowering. Here is a chart to convert Ec into ppm, the ppm is something that you shoukd find labeled in bought water. https://manicbotanix.com/ec-to-ppm-conversion-chart-2/ And yes you can use bought water, i speak this from experience with bottled water.