Assuming the question is aimed at me, and not at the other Mark, I know both Danish and English.

I couldn’t take kanjidamage serious, and while I do like the concept it is done very unprofessionally(IMO). I went through RTK using kanji.koohi all the way, but I have seen others only using kanjidamage. Try both, see what you think.
Personally I prefer kanji.koohi, and it is not like you can get rid of the RTK book just because you choose kanjidamage, it is just a webpage with stories, it doesn’t provide the entire book you, only the stories.

@JKL
My recommendations is that you do RTK if you want to write kanji. Yes it takes time, but you can easily remember how to write all the 2200 常用漢字, and it comes with other benefits as well ^^.

@Isocracy
Yes, RTK has been helpful. One of the best things you learn from the book is how to break down kanji in to “primitives” which lets you break down even the most complex kanji, to parts that are easier to understand. Also now vocab is much easier to learn, and it doesn’t matter how complex the kanji(s) is/are because you have already learned it. As an example I can take a very simple words 熱い. The meaning is simple, but the kanji is somewhat complex if you haven’t learned to break it down. For me this kanji is “mushroom, round, ground, fire. From this I have made a story, and so this kanji’s meaning is clear for me.
That is the case with all the 2200 kanji, and while some are hard to rememember, and don’t resemble the meaning of the words it is used with I still think it has been a great improvment from before, where kanji were just complex lines that I couldn’t figure out.
The only drawback was that it took 2½ months to complete, and it was some pretty tough months. It has payed off, but I would only recommend it if you have enough dedication to keep doing something so boring for 2 consecutive months.

Since you have also asked other questions regarding conditionals, I will just leave this link here, so you can actually try to understand it on your own.
http://www.guidetojapanese.org/learn/grammar/conditionals
Tae Kim covers much more than TextFugu, and IMO explains it better with example sentences and so on.

It is also different from ~なら, which is used to say what would happen given a certain context.

I hate things written vertically, but it still looks interesting.
Thanks for the picture :)
That textfugu article looks rather interesting :D Seems like I might not have to spend any money, which is always good :D Reading something digital also makes it much easier to look up things..