Because they are designed for those who may be less reliable with their spending, credit building credit cards will have a lower spending limit, meaning that they cannot be used to purchase very expensive items.
There is a high interest rate that is in line with the level of risk that lenders are taking by giving credit to individuals in a high risk category. However after consistently paying off the credit you owe, you will likely be able to move onto better deals.
Make sure that you are on the electoral register, as lenders often use this is a way of verifying your home address and any past addresses you may have had. You can do this by contacting your local council.
Another useful tip is to order your credit report, since it is what lenders will be using to assess your eligibility you can check to make sure that everything about is up to date and correct. In the event that you do notice there has been a mistake regarding your credit history, all you need to do is contact the credit reference agency and explain the mistake to them and the situation will get cleared up. You can also add a statement to your record in order to explain to potential lenders why it is that your credit rating is not as good as it could be in order to give them a better understanding of your situation.
If you have any remaining outstanding debts, then it's a good idea to pay them as soon as possible. Any credit cards or county court judgements which you pay off will show up on your credit history and has a positive influence on potential lenders decisions.