Take your current situation and truly ask yourself what you can realistically accomplish (in both short-term and long-term goals). Start from there and don't build too much.
I've always said that writing something down is one of the best ways to keep yourself accountable for any given goal. Having that visual accountability is huge.
With this printable goal setting worksheet, you'll set your big overall goals (the ones mentioned on that first printable), then break them down into manageable mini-goals that can be completed in small segments of time (usually under an hour).