Sorcs have spells known and casts per day. For example, at level 2, a typical sorc would know 4 cantrips (weaker spells with unlimited casts per day) and likely 4 level 1 spells (2 that you start with, 1 from your sorcerer subclass, and 1 that you gained from leveling up.) At this point, you only have 3 casts of level 1 spells per day.

At level 2, you will also have 2 sorcery points which can be used in different ways. You can use these points for metamagic, which improves your spell for in different ways, (for example, a twinned spell [which is one of the best uses of metamagic] will cost 1 sorcery point and allows you to essentially cast two of a same spell at once). So you could twin 2 of your three level 1 spells. You can also spend sorcery points to replenish your casts per day at the cost of spell level +1 . If you want to replenish a level 1 spell use, it costs 2 points. In the futute to replenish a level 2 slot, it costs 3 points, etc. You will gain sorcery points as you level up which will eventually get you more flexibility.

Anyway sorry for the long write up, i hope that explains the core of it. Just some siggestions though, your most important stat is your charisma and your spell save dc (this is what enemies need to beat to avoid your slell effects). Thus it is essential that you max out charisma as you need it to help most spells hit the enemy and affect them.

At the beginning, your crowd control spells won’t be as affective until your spell dc goes up a bit. Tbh you will likely feel underpowered compared to a fighter or melee class as they seem very strong this far. However, if you rest a lot, then sorcs can absolutely be powerful as you will be able to dish out a lot of spells in short succession with thinga like haste and twinned spells, especially when you hit level 5 or 6.