Welcome to the Fleet Stromglade,
Glad to hear you're interested about the exploration side of things, the best way to express your interest especially towards one division or another would be to make sure you fill out your portal Profile's Divisional interest https://portal.starcitizenbase.com/user/view/4115 take mine for example at 90% exploration.
Following that if you join in on discord & teamspeak to start up exploration discussions with other members so we all get to know who you are and what you want to do in a more specialized way.
After that is all said and done after 3 months you can do the following, depending on what kinda of dedication you want to put forward.
Ether get your signature done up so it's Exploration theme'd which anyone can do or apply to become an exploration specialist which will require you to go above and beyond a fleet members commitments.
In the end what every you desire will not limit your participation in anything one division is doing as all fleet members can be equally involved in all divisions.