The old Project Mgmt axiom regarding - Speed, Cost, & Quality. You only get to pick 2, the 3rd is derived from choice of first two (ie if you want it quick and cheap, it isn't going to be any good)
You have a grossly under-powered (and ancient at 13+ generations old) Mobile CPU (optimized for battery life over performance) for real-time video encoding, that with expertise (both in Operating System and OBS Studio optimizations), might be able to be made to work, and even then only with low expectations on the stream. Expect to spend a fair amount of time if a stable stream platform is important [saying this as someone who literally has decades of experience in this OS optimization realm]. I tried some 720/1080p streaming 5 years ago on a much more powerful rig (4 generations newer i5 than yours, Nvidia discrete GPU, etc) than what you have, and with the other Source constraints I had, couldn't get it to work reliably. And I spent a fair amount of time on that [granted, with what I know now... maybe... but you will have a steep (and likely time-consuming trial and error) learning curve. If you have the time and patience, go for it.]
And then, this fall, your Windows OS computer will stop being able to get Operating System security updates (if you are on Win10 already?? if not, that has its own issues). And you want to connect to/stream to the Internet, so unless you were an IT security expert, you'll need a new computer to run Win11 (or migrate existing PC to Linux and learn whole new environment). For lower-end mini PCs, for lightweight streaming, some new systems aren't that expensive (but not free) though don't expect such low-end system to grow into 4K AV1 video in the years to come (likely to become the new streaming standard (vs H.264) in a new systems lifetime)
All of this to mean... do NOT expect this to be easy. And then you may have to replace it soon anyway.
With realistic expectations, I wish you good luck
There are numerous threads on this forum on optimizing basics for an under-powered system (from OBS Studio perspective, not re-scaling, not using Studio Mode, ensuring all audio devices using same sampling rate, avoiding CPU intensive plugins, filters, effects, etc.)