Basically what I'm asking in the title, I don't know how to organize my previous thoughts with my present ones. Let me explain.
I have very bad memory. And I like to philosophize, but I don't study philosophy, so I guess I'm kind of an amateur. Anyway, every day or week or so, I stumble upon a new idea or thought I think is quite remarkable, and I usually write it down. The thing is, after a week has passed I don't develope this particular idea anymore, and don't connect it with the new ones I may be having, so it gets discarded like all the other ones, and I won't think about it again unless my thoughts bring me to it again, time in which I will think "wait, I had already come across this". And, another example, if I for some reason read what I wrote, I usually don't remember how I wrote it and feel like it's from a different person, and if the text doesn't explain the train of thoughts I had, and just states the general idea or the conclusion, I can't remember how I got there.
Apart from it, when I have a new weekly idea it tends to become the center of my thoughts, like I find this particular idea is connected to a lot of questions I may have, and like it is the root of everything else, until I get to a new idea that will take its place.
So, basically, what I'm asking for is, how can I, when I have a new idea, transmit it clearly to what I'm writing, so then when I read it I remember how I got there. And also, after it's written, an important part is obviously to re-read it, so do you know about some kind of habit or system for organizing how old ideas can be brought back and connect them to the present ones? And finally, I often find myself that I might not be able to sit in a table and write for as much as I need, but instead can only write short sentences (I don't know, if I'm in the train or something, for example) so how can you, by writing a little or by memory, later remember what you were thinking and how you got there?
I'm sorry if this might be a little out of topic, since I don't ask about a particular philosophy question, but rather how to make philosophy.