The striker, who left CSKA Sofia, was on loan at St Johnstone last term but, despite an initially successful partnership with Fran Sandaza, the Irishman ended up with five goals in 32 games in all competitions.
He joined Kilmarnock last week and claims he was persuaded to reject other options in the Clydesdale Bank Premier League by Kenny Shiels, his new manager, who told him he was the perfect fit for the style of play at Rugby Park.
"I need to score more goals," said Sheridan. "Last year I was doing a lot of hard work but I just didn't have the goals to go with it. That's one of the worst things, when you finish a season and you have been playing so many games, and have such a small number of goals. That's the thing I need to work on and hopefully I can do that here."
Sheridan added: "I had a chat with the manager before I signed and was excited about what he said. When you know how keen a manager is to get you in, it helps you make your decision. I had a few SPL options but he said the style of play would suit me, and when he is so keen, that really can sway things. He wants someone up top to finish all their passing. I like to make runs and I think they have got midfielders that can pick them out."
Despite being unable to settle in Bulgaria, Sheridan does not regret his move. "The weather dictates a lot," he said. "You are training in the evening so you are hanging about all day. My last game was in 38 degrees, so it totally drains the energy out of you. It's more technical, but there were a lot of positives as well, to experience a different side of playing football, and I think I was lucky to get it at such a young age."
Hibernian can also field a new signing after they agreed a fee and a sell-on clause with Carlisle United for Tom Taiwo, who signed a two-year contract with the Edinburgh club. Although the former Chelsea prospect was out of contract, Carlisle were due compensation for the development of the 22-year-old.
Taiwo was a youth international with England while coming through the system at Leeds United. In 2006, Chelsea paid £5m for Taiwo and Michael Woods after a dispute over Leeds' claims that the London club had tapped their players. He left Chelsea in 2010 and was a first pick at Carlisle in his three years there.
Also available for Hibs is Ryan McGivern, the defender signed on loan from Manchester City. The 22-year-old has played for Morcambe, Leicester, Walsall, Crystal Palace and Bristol City as opportunities to play for his parent club disappeared with every superstar they signed.
"It's extremely hard but I'm at an age where I need to get out and play, I can't be sitting around not playing football," said McGivern. "From when I first signed it wasn't like what it's like now, everything has got so much bigger and you see the standard on the park. It's harder for young players to come through.
"It has been good to have the opportunity to train with these players and see how they handle themselves. It's good for a young lad, picking up things in training from those kinds of players, world-class superstars."