@syoxu
First try to launch the game in SP without any mods.

Creating a character from scratch is pretty labour-intensive, so most ped mods here are textures/skins and rigged models from somewhere else. If you could provide a (reference to a) character model in the Request section, the chance that someone picks it up is higher.

You can utilize classes (or structs) to group information.

What is it exactly that you want to change?

I suggest you to rephrase your question after reading this: https://forums.gta5-mods.com/topic/13256/how-to-ask-for-help-and-support/

@ChicagoNARC

Some initiative is expected if you want to play with mods.

1. Replace your modded mods/update/update.rpf with update/update.rpf. This always needs to happen after Rockstar updates the game.
2. Re-install your mods, be it .oiv or manual installation. Just re-launch the installer or follow the mod installation instructions again.
3. If you've got add-on mods, now is a good time to add them to dlclist.xml again.

There's no "it" to "break down". If you've already installed mods once you've already done all the steps. Just repeat them after replacing the old update.rpf with the new one.

@ChicagoNARC
That is pretty specific. You just have to suck it up and re-install the mods you want to have, if they're affected by update.rpf.

Are you using any mods/did you use any mods?

Realistic car suspension/top speeds/acceleration & car/vehicle physics in general as well as damage/deformations.

Realistic Driving V is a good one. As for damage/deformation, it can make deformation more serious, but nothing exists to make deformation like Wreckfest/BeamNG/iRacing.

Realistic Blood effects such as wounds/splats/drips/bootprints/pools etc.

There are some gore/blood effects mod, check the screens to see which ones you prefer. imho ZippoRaid's one takes it a bit too much to Quentin Tarantino levels. Doesn't Ripplers Realism V have it already?

Realistic explosion effects/fire/dirt and such.

LeeC2202 had a great vehicle effects mod but he left the scene. Eddlm made an alternative VisualFX which looks nice. As for the textures themselves, I haven't looked into 'em.

URLs to the files are on http://patches.rockstargames.com/prod/gtav/versioning.xml, but the game patch can't be downloaded directly via your browser.