After 1.d4 e6 (a typical way to reach the Dutch without the Staunton Gambit) I years ago decided on 2.e4! The reason is mainly psychological: Black almost never meat this, as few 1.d4 players switch to an 1.e4 opening. And unless Black normally plays the French, (and few does) he will be in new territory.
After 2...e5 you should avoid the theoretical lines (3.Nc3 and 3.Nd2) and go for 3.e5 wich is my choice, or 3.exd5 wich has more venom that you should think. After 3..c5 thare are lots of tactical possibilities and also gambits.
I was PLANNING on just booking up with a 1.e4 repertoire, but when I see that the latest king's gambit book is 680 pages, well, that's a lot of study when one includes Smith Morra Gambit, Caro Kann Caveman, 150 attack, Krejcik Aleknine, and Orthoschnapp (looks fugly & not that tactical with just one's queen out in an ugly spot) or Monte Carlo Exchange in the French with BDG for the Scandinavian, but It's looking like BDG & Tromp are much quicker routes to getting booked up. I need a black repertoire too and am planning Albin Counter and Fritz/Schliemann as shortcuts to Marshall Gambit & 2 Knights to drop Stonewall & Center Counter, though I'm not seeing ANNOYING 1.e4 d5 2.e5 like I used to when I quit playing.
The problem I'm having is that there's very little theory for 1.d4 e6 2.c4, the Horowicz Defense and I just wasted a couple hours looking into 2.e4 and French transpositions there, with ZERO info on the tactical lines I'd hope to play... just data dumping off LiChess' database for "best performing lines" (rarely what GMs or Stockfish recommend!).
Any super tactical, even gambit lines for 1.d4 e6 would be appreciated as well as recommendations for the Benoni. Stockfish prefers 1.d4 c5 2.d5 heading into King's Indian, semi & Czech Benonis. I couldn't find ANY info on aggressive lines there either. I was getting a headache just trying to rebuild my King's Gambit repertoire having not played in years until THAT became too daunting... wasting days just charting all the Knight Gambit lines.
1.d4 d6 is ANOTHER "what should I do?" line. I was leaning towards the 150 Attack there as I studied it as 1.e4 before and could keep that when I return to open games, but I was curious about the Wade Defense 2.Nf3 vs. 2.c4. I'm not a fan of EVER pushing my c pawn except to gambit it for Nxc3 in the Smith Morra. 2.Nf3 = rapid development. I think I'd rather study that IF there's potential for white to get tactical.
Any suggestions for OTHER lines I should look into (Staunton Gambit? yep!) for my down & dirty low book 1.d4 repertoire are greatly appreciated. If I had my way, I'd play nothing BUT Smith Morra Gambit! I was terrible against Sicilians until I learned that and was in tactical heaven raking +400 points in just in 50 games. (only counting Smith Morra games).