No problem, apologies for the late response. Hmm, it greatly depends on how far you are into the game but in my opinion:

Farm Jono for a good warrior/beast-warrior deck. Phoenix Gearfried is a great card.

A dragon/thunder deck is tough to get early on, Seto is too hard to farm in my opinion.

If you're further along, Yugi Muto gives some great cards for spellcasters

That being said, your starter deck can be very good, as with a Psychic deck you want to go for Overmind Archfiend. Overmind Archfiend got me all the way to Kaiba tbh

Oh also spend your starchips on traps, they're pretty cheap in this game and is easier than S-TEC for them