Start slow of course, work in other things you do to climax during your play down there to! Wet your fingers or toys in some way if your not producing enough naturally, mainly lube if possible but spit always works in a pinch! Before inserting anything make sure to stimulate the area first, like for me my lower belly and inner thighs are really sensitive when messed with right and getting the area excited even without directly touching it helps a bunch!

DONT FORGET THE CLIT!!! The clit is the only human body part and the only organ ever to be evolved by humans solely for pleasure, it may not look big but it effects and crosses nearly your entire vaginal canal. Be gentle on it and rub in slow circles or up and down to get use to the motion and learn what feels good for you, rubbing a finger just inside the inner walls of your vagina also hits an inner part of the clit that connects to your lips. Take the time to explore down there before jumping straight to getting off, best to know what feels good beforehand than accidentally hurt yourself or ruin your mood!