Hey, I'm fairly new to D&D and would like to start playing but I don't have a person to play as. I would appreciate it if someone could help me build a sorcerer. I've already started a little bit btw.
Welcome to the boards first of all! And second of all, welcome to the wonderful world of D&D!
Now, you have already taken your first step towards building a character, picking a class. The next important steps are Race and Background, as both will influence the type of character you will play. For Race I would suggest picking something "boring" like Human at first unless you feel like really stretching your character wings. Their are optimal Races to pick, and as a Sorcerer any that give bonuses to Charisma are good choices, but don't worry too much about optimizing right now.
Next you need to pick your Background. This is what your character was doing prior to being a Sorcerer (or maybe during their "training"). This will help mold how you character came to be. Was he a Criminal who got caught one night while on a job and suddenly found out they had a talent for magic (like a Mutant in a comic book)? Did he spend his time researching in a library to try and figure out how to hone his skills (Sage background)? Or maybe he was a Soldier in the army until he started blasting fools with fire and thought he was destined for greater things? There are a lot of options and thinking about that can help shape how your character acts and reacts to the world.
After that you can fill in your Stats using whatever method your group uses as a Standard. Highest stat goes to Charisma for Sorcerer. Remember your Race and Background though for all your other stats. If a Soldier you might want higher Str/Dex/Con than if you were a Sage. Or you can just optimize it and go Char > Dex > Con > Wis > Int > Str.
From there is just a matter or picking your starting kit, selecting which skills you want to be proficient in, and lastly choosing those juicy spells. I would recommend not picking all Offensive spells, as you will want some defense or utility as well. Remember than Cantrips can be cast infinitely, so choose at least 1 Offensive spell as your "Bread and Butter" attack spell.
Outside of that, you should be set for your first adventure. Let us know if you have any other questions!