Whatever you're thinking of studying (whether it's the odd course or a whole qualification), the best place to start – for almost everybody – is with a Level 1 course. Level 1 courses are roughly equivalent to the level of study in the first year at a conventional university, and you wouldn't expect to skip that! Level 2 study is demanding, and we find our students are most successful when they've done the groundwork that Level 1 is specifically designed to cover.
However, for some students, with enough experience, it may be possible to start with a Level 2 course. If you're considering this, further guidance can be found here. In addition, you can speak to an adviser.