Cannabis is an excellent plant to grow for complete beginners and the same goes for Canna nutes. Hundreds of thousands of beginners have used it successfully. Not the greatest, lots of rip off additives, but the terra vega and flores is decent stuff, fairly cheap and easy to use, decent NPK. The instructions suck though, they mention how much but not how often. Don't add it every time you water. And if you need to water twice a day you need larger pots. Water only for two days, then a day with the nutrients, then two days water only again, and so on. Or one day nutrients one day water etc. Unless/until you start seeing deficiencies. It's fairly weak stuff but using the Flores excessively is a quick way to get yellow plants, easy fix is (after watering a day) dumping more vega in it.
may be full of nutes,and I may not be able to use them?
Sounds like something you read in a forum. A plant turns nutrients into more plant, like leaves, branches and flowers. Check out a few grow journals and you can get an idea of how the plant should develop and look.
If anything use google type in site:rollitup.org (type in what you're sesrching for)
Funny, I always use -site:rollitup.org