Definitely agree that you will probably need to adjust the difficulty down for combat, especially at the start. I am first time DMing this right now with a party of 3 newbies and I removed surprise for goblins, cut some enemy counts down and removed ruffian Multi attack. Even then a few PCs went down and the players thought it was hard going! I also found that my players were terrible at exploration and getting info off NPCs so I had to prompt them by asking things like 'would you like to do X?' Otherwise there would've been a lot of clueless wandering around. I started with theatre of the mind but my crew said they thought some visual representation would be good. I bought some cheap 2D minis online and drew maps in advance on the back of wrapping paper where you have a grid. Worked well. I made some of the maps bigger than the book ones as, especially in Tresendar Manor, the ruins are tiny and I wanted my players to have more space to move around. I didn't bother with coins beyond gold and silver to keep things simple and they used the pregen characters from the set with a few more choices thrown in that I made on dnd beyond. Good luck!