Well, you could start with only Marksman and then see later what you want in addition, if anything.
And since you said before that you're "not at all into min-maxing", you maybe shouldn't let an unoptimized build stop you from finally playing the game. Dull theory can only take you so far.
For example, I decided only at our last D:OS session which of their resp. three spell schools my Inquisitor and Jahan will be specialising in from now on, since I won't have the points to max all three. Apart from some basic prerequisites, character development in D:OS is an open, fluid progression rather than a fixed path one has to decide at the beginning like in other games.
