Tip 8: Single floor/small buildings normally have a mini-boss in them behind the key door. Keep an eye on your experience so you don't waste Meds, you'll need them later. Tip 7: You are fully healed after you level up. You get one skill point per level, use them wisely. Tip 6: To 'Dodge' or 'Kick' you need a point in those skills.
Tip 5: Try not to travel too far until you are past level 5 (stay on starting street) Tip 4: While on the street, places with green names will have quest objectives in them, yellow is safe house, and white just has loot/zombies (can be worth exploring for gear and stuff) Tip 3: There are many rooms in the Police Station, explore a little to find more NPCs that will give you quests. Try to fire only single shots, this will save ammo and do much more damage. Tip 2: Take your time to aim, and always aim for the head.
Also attacking will move you forward slightly, be sure to back out of range after attacking.