This forum is full of useful information for changing the RMS and I would be surprised if anyone could add anything new to what has already been posted. Here's what I would do:
1) Search, locate, print, and follow RMS installation techniques from this forum.
2) Buy quality seals, gaskets, and RTV.
3) Use utmost care to avoid scratching the upper bearing cap during upper seal removal.
4) Remove all old gasket or sealant from oil pan or lower bearing cap with appropriate devices.
5) Don't damage the lower bearing cap when clearning.
6) Loosen all bearing caps during upper seal installation.
7) Torque all bearing caps properly during installation.
8) Use rubber bands to hold the oil pan gasket in place during re-assembly.
9) Avoid over torquing the oil pan gasket.
10) It probably wasn't your RMS. Check your oil filter adapter (OFA) o-rings for leakage.
11) Get your name in red and start reaping the benefits of a paid member.