New pads, no result. How do I fix it?
 

So I changed my front break pads of a 96 civic ex. Everything went good, excepts the bolts were really hard to get off. Anyways, so on my first attempt I accidentally unscrewed the middle screw of where the breaks pads are in. So once I unscrewed it liquid came out. Assuming it was the break fluid. So once I completed my brake pad job I went around the block to test drive it and notice something different. I have to press on the breaks till the floor before they actually start breaking. Is it because I accidentally opened that screw and now it has air and now I need to bleed it? Or is it because there new and Im not used to it. So please help me on this and tell me what I need to do to fix it. If you need to know any additional information, please let me know and I will provide it for you guys. Thanks for looking!!

Yes. Bleed the brakes. You are probably low on fluid as well if you didnt refill the reservoir.

Should I bleed the front ones since thats the only one I changed or I have to bleed all 4?

Just the front.

You should bleed all four corners. Once the system is open, air gets in. Since you closed the system and pressed the brakes, air could be trapped anywhere I the system. Google search how to bleed your brakes. Once your brakes are bleed and you have good pedal response, you need to "bed" in the new brake pads. There should have been some instructions for your pads on how to properly bed them in.

The air is really unlikely to have gotten past that one brake line.