There are no simple tips here. There are a lot of such planners, but I, for example, having tried a bunch of them - I haven't found it for myself.
And it's hard to rely on other people's advice here - you have to try it yourself and choose which one will work, which one will be SUFFICIENTLY comfortable with.
There are fancy ones - like Outlook, there are more specialized, but also serious ones like TodoIst, ToDoList (http://abstractspoon.pbwiki.com/f/todolist_exe.zip - Russified, but only Windows), there are the simplest, but cross-platform like Todo.txt - and a bunch more.
Look in different soft-catalogs in the section "Organizers, schedulers" (it can be called differently.
I usually looking for programs similar in purpose through the site alternativeto.net - just enter the name of the software you know, and the site gives you a list of alternatives.
Todoist. With a PC, you can use the web version (significant, but the only limitation), and there is a good app for smartphones (better than any.do). There are no downsides, useless functions can be disabled, and premium is sold only for the sake of more useless functions (like statistics ... it seems like it would be nice to have such a feature for a good program, but on the other hand, is it necessary?).
I used it myself for quite a long time, until I gave up on planning everything - I just started not using it.