i agree that you dont want to jump in and do too much from the start and get burned out, but by not planning and hoping to just naturally develop the drive to want to work out more, you arent taking yourself seriously enough. it comes down to discipline and motivation; if working out is something you want to do, then do the research, develop a plan and follow it. spending a few weeks getting acclimated to the gym and routine is ok, but you arent accomplishing much during that time and you are essentially telling yourself that you arent able to commit to anything without mental tricks.

figure out what your goals are, what you truly want. if you want it enough, you will do what it takes to get there. if you have to trick yourself to develop the motivation, then your priorities arent in the right place and you should re-evaluate your goals.