Help me please!!!

I have a 91 celica gt and when i got the car it had a battery in it that was lower than what is required and i didnt know that. i got some very bright xenon headlights and they started draining the battery. and after so long when i drove at night i couldnt turn the car off cause i would have to get a jump start to get it going again, during the day with no lights it was fine but then it got to where i had to get a jump all the time even if i hadnt used my lights at all. so i decide its time to get a new battery so i get a battery with 750 cold amps and 630 of whatever else it is they have. i had taken my old battery out the day b4 and i got the new battery and put it in and the only thing that worked was my headlights. the car will not start at all when i turn the key i mean it does nothing at all. so i check fuses and there are 2 blown. one was a #20 for the dome lights and they started working after i replaced that one. the other was a #15 for the EFI which i dont know what that is. i replace that one also and the car still does not start. my radio doesnt work and i have power locks and windows that also wont work and it all worked fine b4 i got this new battery. someone please help me. the only locations i know of for fuses are beside the battery and inside the car beside each door on the side under dash i checked them all and all were fine except what i already mentioned. i think the battery may have been hooked up backwards also for a few seconds. thats probably where i fucked up

and i just got a new starter a month or so ago

can someone at least tell me where the fuse for the power windows and locks is at. or if it could be the engine relay which is located in the same fuse box that the 2 fuses were blown in. how i check it or replace and so on