Congrats and welcome to the forum. Your car and engine are one of the favorites here. Using the search function, you will find tons of great information on every aspect of the car.

The items that you mentioned that need to be repaired are some of the common fixes for that car. I repaired my window regulator myself for about $4 in hardware.

The locks may take time to fix. But the parts aren't so bad. You will need a mity-vac for that and anything else on the vacuum system. A/C is also doable but can cost a few hundred even if you DIY. All the parts are available. You can probably just adjust the emergency brake and it will work. The tranny linkage bushings are also not too bad of a repair to do. The special tool helps.

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Doug

1987 300TD x 3
2005 E320CDI