Business Expenses

I am having a hard time remembering that I work for myself now and need to keep track of my business expenses. This might sound silly but I am not someone who typically hangs on to every receipt for the things I buy like Studio RTA furniture, office supplies, stamps, and miscellaneous expenses. This going to have to change soon because I know that come tax time I will be kicking myself for being so careless. If only I had a good office manager I could put her in charge of this!