If you are new to mesh bodies or new to second life, this Getting Started page will help you guide through the first steps of unpack, attaching etc.
Lara Mesh Body v5.0 Change Log
Lara Mesh Body v5.0 Change Log
Lara mesh body HUD V5
Layers and Applying
Skin/Base
Hands/Feet
Misc
Save stick
Making appliers
Alpha auto-hide
Feet auto-select
Bakes on Mesh (BoM)
Replace links in saved outfits
Skin matching
"Petite" small breasts add-on
Additional Resources
Marine Kelley's Blog on Lara v5
Here are some links to YouTube videos that may help you get started
MAITREYA 5.1 - TUTORIAL (A bit dated but the info is valid)