Yes, you just have +5 vs reflex.
Unless you took an expertise feat (such as Totem ExpertiseDDI) to gain a feat bonus to attack rolls, then the only bonus you're likely to have at level 1 is your wisdom bonus.
The modifier for those attacks is calculated as follows:
- +wisdom modifier (-1 to +10)
- +half your level, rounded down (+0 to +15)
- +implement enhancement bonus (+0 for a non-magical implement, otherwise +1 to +6)
- +feat bonus (+0 if you don't have a feat for it, otherwise +1 to +3)
- +superior implement bonus (+1 if you have an appropriate superior implement and the feat for it)
- +/- any situational modifiers
Note that all druid beast form powers have the implement keyword, and that (as Joshua Aslan Smith pointed out in his answer) you retain the use of implements you were wielding when you entered beast form. This means you gain your implement's enhancement bonus to attack rolls. Also, implement attacks never get a proficiency bonus, so proficiency with claws is a non-issue.
At first level +5 is a perfectly good attack bonus; most enemies are going to have a reflex of 12 or less, so you'll be hitting on a roll of 7+ on a d20.