Hi!
First the Webra 10cc engine is way too big/powerful for the SIG CUB! A more suitable engine size is a 6,5cc (.40 ) two stroke swinging 12x4 prop (in case of the CUB). That engine size is also more suitable for the high winged trainer that you must fly before you even try the CUB.
Second: The SIG CUB is not a suitable "new bee plane"! It might be a high winged plane but it flying characteristics is not in line what characterizes a trainer.
Third: To be successful in R/C flying it is vital that you join a club and get help with flying otherwise you will crash or never get the plane/engine working!
Fourth: Get rid of the old batteries! -You do not know how old they are and in what condition they are.