I'd also recommend you to check the Analyze tab in the main menu frequently for new demons. Sometimes you will see ones that have useful utility skills (e.g. healing, escaping battles, buff, debuff etc.) You can then get them in two ways:
- Check their location, go there and "catch" them with negotiation.
- Fuse them in the World of Shadow, and this can be done more easily using reverse fusion, or at advanced level, reverse compedium fusion.
Another important aspect of raising and fusing demons is skill inheritance. Most of the time, you will choose the skills for your fused demon from a skill pool from its "parents". Some skills will be greyed out since they are unique and can only be learnt by one demon. At an advanced level, you can be prepared to chain-fusing 3 or 4 times to get your desires demon with desired skill set.
Regarding changing affinity, you can do so in the World of Shadow as well, but it will be unlocked later I think.
Regarding stats distribution, I don't think you have misssd out too much, since we don't have that many points we can freely allocate to V-kun upon leveling up anyway. I think the ultimate purpose of such design is to ensure new players will not hamstring themselves, and experienced players can enjoy more flexibility in building V-kun as they wish (most of the time to counter particular bosses).
Also this may be unrelated, but
@AquaWateria can you pls gather some posts from experienced players and make a threadmark when you have time? I think it can help alot guiding new players into the game considering its steep learning curve.