If you’re able to communicate via sign language, you can overcome any communication barrier. Even if you’re still in the learning phase, don’t worry! Over time you won’t have any problem communicating.
Determining the best sign language will entirely depend on where you live. If you’re living in America, then you should consider learning ASL since it’s the most popular sign language there. If you’re living in the UK, consider learning BSL.
Both ASL and BSL differ significantly: BSL uses two fingers for alphabet signs, while ASL uses one hand for alphabet and a mixture of one or two hands for signs.