Welcome to the world of lower league management!
It can be really difficult at times, but the rewards far outweigh the minuses. So far I've taken Woking from the conference to the 2nd division, and I've started a new game with Blackpool.
Signing players is basically a matter of who you can snap up on a free. What I did was go to the Player search and search for players available on free for each position I needed to strengthen, but I asked the assistant to filter our unrealistic targets to narrow down the search to people who'll actually want to join.
But anyways here's a player or two u can sign to improve your chances:
Sign
Ian Simpemba on loan or better yet, buy him if he's on the transfer list. Offer Wycombe their asking price. I played him a lot at the left of defense with great effect, but he's better as a centerback or center defensive mid. Nice solid player.
Sign
Carl Laurie on a free. Great defensive mid, a great tackler, team leader, and he even scores the odd cracker from out side the area.
Sign the Icelandic duo, Porhallson and Kristjansson on free, but dont copy that exactly as I most likely spelt it wrong, but I'm sure you know of em.
Thats about all I can think of, sign some players on loan, frees that would fit into your plans and the type of game u want to play and u should do good.