Have a read of the sticky thread at the top of this forum for general information on Jobseeker's claims (including the guidelines on disqualification)
http://www.askaboutmoney.com/showthread.php?t=98113
Each case where a disqualification may be applied is assessed on its own merits (within the guidelines), so it's impossible to say with certainty that you'd be in or out. If you're available for, and looking for work now, then apply for Jobseekers and see what happens. If you are disqualified, you have the right of appeal.
If you are disqualified, you may not be eligible for any other SW payment during that period of disqualification.
The scheme which "fills the gap" for people waiting for SW payments is Supplementary Welfare Allowance, administered by Community Welfare Officers at the local health centre.
One of the qualifying criteria for SWA is that you must not have deprived yourself of an income, so you may be refused - again, if this happens, you have the right of appeal.
SWA is a means-tested payment, and since you are under 25 and living at home, you will be means-tested on your parent(s) income for this scheme. You would have to supply evidence of your parent(s) income to the CWO.