How much does it cost to fix a short in my 89 camaro,also have a few more questions?

my brother gave me his 89 camaro

and of course thre was some problems



he said the battery gets drained within 1 hour

around how much would it cost to fix



and also if you can help

im also changing the starter the pan and the fuel pump

ive bought all these parts,question is around how much would it cost to get them all installed

all information is greatly appreciated,im trying to bring this baby back to life and on the road again.How much does it cost to fix a short in my 89 camaro,also have a few more questions?
Is it drained with vehicle running or now? If so alternator less than $150. If not need more detail. Not sure. It not to hard so probably less than $500 excluding alternator. At least where i live that's accurate.