Is it still advisable to use Bittrex or better start off somewhere that is more stable than this? Any suggestions?
This is heavily depends on your location. It seems Bittrex have major problems with just about any location besides US and UK. If you located in some US unfriendly country - better to stay away - miracles like instant account blocking may happen to you any moment.
Also bittrex new user registration currently disabled and tech support can't handle tickets.