Since you're new, i suggest learning your way around the map, and where the hotspots are, just in case you manage to kill somebody and need to escape quickly. The suicide bomber kit isn't very fun due to the sheer lack of kills that you'll be getting, so i suggest either the swordsman or the tank kit, since they absorb / deal the most damage. Try getting into 1v1 fights with people until you have full iron armour + an iron sword, and then run around killing people with the advantage in equipment that you have.
Finally if you have a lot of points, there's a sign that gives you access to a shop in the spawn area, which sells you god apples, protection II diamond armour, and potions ^.-