It is possible to build a great team with 35T and be able to compete for a treble, your chances will be greatly improved if you draw a weak cup and same level Champions League. Decide on what is the main formation you will use and look for the players you need to create it. Staying out of bidding wars is important. It is possible to find a gem of a striker or winger in the 27-29 age range by checking out that player's stats, at the beginning of the season not too many people will be looking for these as they are looking for fast trainers mostly. There is much more, but I don't feel like writing a whole guide. Good luck though!