I think CFC was hinting at, but didn't mention, if you only use a small amount of testosterone (or masteron for that matter) irregularly, you likely won't see any benefits. You're best bet would be to research AAS use for a while till you understand the commitment and potential health effects enough to make an informed decision on if you want to continue. If you decide you're ready and have a dialed in workout and diet, read the sticky on first cycles and try to replicate it or something substantially similar. Masteron is probably not needed for your first cycle, and is usually a short acting ester (has a short half-life) so you would need to use it much more frequently.
To concur with CFC, two well spaced out small injections of testosterone probably won't affect your health much.