How to get tone/toned in 1 month?

Now I know that is a short timetable, but I only weigh 117-120lbs standing 5'7. I have somewhat a stomach lol..so on that note. What is a good EASY to get into method. using dumbells, sit ups, watever. for a total workout. Ways to workout legs alternativly to jogging? Pec exercises? I can NEVER keep up any sort of routine due to UNCERTAINTY/doubtfulness that it isn't enough or not a good method. Questioning If my 30-40min workout was enough? I don't know why I'm not sore? Or not sore in areas I worked, but broke a nice sweat? I put pressure on myself. I get easily discouraged and dont want that ANYMORE.. please help! Just people with real experience not half-assed anwsers!