As a hobbyist, I suggest that you get yourself some good brand name bits when you first buy them, but don't think that you need to buy them all at once. Buy each bit or group when you will be doing a project that will use them. I would buy maybe one of each of these in this order and then expand your collection as you learn to use them and can afford to buy them.
You will likely need these bits in this order when just starting out and you will use these bits frequently, even after getting more competent with your abilities. Spiral up cut bits 1/4 & 1/2", preferably solid carbide, a flush trim bit with bearings both above and below the cutter and a cutting surface of about 1 1/2" , a rabbeting bit set with bearings for many rabbet sizes, a small hinge mortising bit with a top bearing will also be frequently used. You will likely use these bits above most often, so buy the better quality the first time.
If you will be doing cabinet work I highly recommend the Sommerfeld offset tongue and groove set, and his rail and stile bits, but watch his videos before buying them so you understand how to use them his way. They can be great time savers and produce high quality cabinets.
Then, as you expect to need them for an upcoming project, get round over bit sets, ogee bit sets, bull nose bit sets, etc from Woodline or some other cheaper, but reputable, router bit source. In most cases, you won't be using these as much, so these cheaper, but good, bits will last you many years. If you find that you are using any one of these bits heavily you can then buy a better quality replacement bit.
Charley