you cant just go to university before doing a levels, so you'll have to do them first. Then you can either go direct to teacher training degree, or get an ordinary degree and do a pgce course (post graduate certificate in education)
You CAN get a University place without A-levels. You can gain a degree from The Open University (open entry). You then do a PGCE course (Post Grad Certificate in Education) which involves work placements in schools. You need to decide whether to go for primary or secondary education for the PGCE programme. To get free careers advice, contact the Open university for more of this type of information and advice specific to your circumstances. Hope this helps. Good luck!