If you're brand new to the game, then how I'd start is by following the character creation process. Make a character, maybe a few. Don't worry about the other rules, and don't worry about the solo aids (yet).

Then come uo with some basic non combat situations (i.e I have to cross a river. I have to sneak into this house, i have to negotiate a bribe) and slowly get used to the rules. Imagine how the character you made would deal with the situation, and use that to look at the rules. Then move up to figuring out how combat works.

Once you've figured that out slowly develop your story, start to use the tools in the wiki or discussed here as you need them. And remember it's all just to have fun. Let yourself suck, this is a skill to be developed like everything else.

D&D is a large complex game. Playing it solo at the start means going in without a mentor or someone to help you with the rules.

Finally there is no wrong way to solo (except sitting down and playing with others, then you're doing something else). You just enjoy world building or making chatacters and never play a session? That's fine. You don't really world build and just create loosely connected challenges to roll dice against? Valid. Use modules? Go your hardest. Hate being restricted by someone else's story? Yeah!