Okay, let's look at what you really have on your plate.. you aren't really out any money at all even if you lost these plants, seeds are cheap enough and as long as you have the equipment the money you spent is an investment, because it's yours and you have what you need. Plants can really tolerate a lot of mistakes, issues, weather, animals and everything else nature has to throw at it, inside under human care the chances of a plant's survival is greatly increased. This is the best place to be to get help and information about everything you are going to want to know, and seriously do not pay those rip off sites who claim to teach you to grow or be the best grower, I've seen enough of them sites thanks to others to honestly tell you that you can learn more from a $20 by Ed Rosenthal off from Amazon than you will paying out great sums of $$$ to learn less from them, including those places who have 'expert growers as Mod's to help you' because seriously it's people off the Forums from places like here who get some free seeds to help other growers. This is seriously the best site I have ever found to learn everything you want and need to know about all combined into these amazing well written articles, I even get the weekly email from NebulaHaze here by signing up for the weekly newsletter, which I enjoy reading, among some others I also get.
Don't ever let a company sell you on needing their additives, their products, etc... at the end of the day it will either work or it won't, how will you ever know if you have never grown it without it and then tried it with it to see if it really made a difference, and still then improving your growing area always makes a difference, so don't get sucked into thinking you need all this stuff... you really don't. There is enough people who have grown it under every light and condition known to mankind, that you won't be discovering this "never heard of product before that is taking the cannabis community by storm" because seriously someone has pretty much done it all and today the biggest things changing is being able to grow it better because of places like this educating people to become better growers by giving you all the information you need for free to become a person who falls in love with growing your own. That's the best advice anyone could give you right now to put you on the right track, in my personal opinion.