Which method of access? Client or SSL? It's fairly easy using the ASDM. CLI is a bit more complex.
Also, how many access-groups? You configure access groups on the ASA just the same as on the 3000 series. Different groups have different ACLs and such. This way you can control them and where and when they can go somewhere.
How will the authorization/authentication be controlled? All local accounts or thru RADIUS?
There's many guides and configuration help under the URL: http://www.cisco.com/en/US/customer/products/ps6120/prod_configuration_examples_list.html
Please let us know if there is more we can help with. BTW, you need CCO access to get to the above link.