As an inexperienced buyer, it’s risky trying to find a good deal. Genuinely good deals are usually quickly snapped up by experienced buyers. If you have to ask for advice you’ll miss it. If it’s still available, chances are it’s crappy.
For a new collector, the best advice imo is either; 1) hold off buying until you’ve done lots of research to educate yourself (takes time), or 2) pay a bit extra to buy from a well regarded collector (takes money).