I have core set and black riders on the way as my starter thanks for suggestions

That's great! I think I'll go for it. Question: when you construct a deck, do they put constraints on the cards you can put in there for thematic reasons? Seems like you have to adhere to particular rules of deck construction depending on the campaign, or can we put whatever cards we have regardless of campaign?

there are no rules in terms of theme but some people like to make thematic decks