Hi, look, is not that hard. First thing is:
Install a skeleton compatible with bodyslide (XP32 Maximum Skeleton Extended is a great choice)
Then you need a body and skin texture (CBBE by Caliente is my choice)
Then install Bodyslide + Outfit Studio by Caliente
Open Bodyslide and choice a preset that you like or build your own with the sliders ( be careful to choice a cbbe preset and not a UNP or anything else.)
Press the Build Button and you're done.
All that you can find it on nexusmods. That is the easy way, now if you want to personalize armor and outfit with your preset, you need to download armor with cbbe +bodyslide support and open their slides with Bodyslide and choose the one of your taste.
In Bodylide page on nexus you can find excelent tutorials about converting differents bodytypes and creating sliders. If you like i can provide my sliders for you to play and modifying. Check how they look on the images. First you have a body preset with hdt support and then the same preset modified for tera armor with tomcat addon.