You will need to have the system evacuated after you fix the leak, to remove any air and water. Any air in the system will kill your performance immediately, and water will kill your compressor eventually.
Also replace the dryer (be sure to add oil). Since you have a bad leak, you have to assume that your dryer is no good at all. Some repairs can be done without replacing the dryer, but this is probably not one of them.
The above is in addition to whatever else your system needs.
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