Help For Newbie , DoCmd.RunSql

hello,

im creating a small database and am extremely new to vba, ive got stuck on running a select query from within the vba code itself, the book im currently reading while learning about this stuff suggests my code whould work but after looking into it i believe its wrong as ive read various threads saying you cannot use docmd.runsql with a select query, just wondering if anyone could help and throw some light on how to get this little bit of code working. below is the part of my code that falls over,

basicaly it should lookup the weight based on what the parcel type is and find the price, the parcel type is worked out earlier in my code and is held in strParcelType, theirs probably an easier way to do this as well but have'nt got that far in my book :)

intWeight = Me.txtWeight

Select Case intWeight
Case 0 To 100
intCost = DoCmd.RunSQL "SELECT pricetable1.[Postage Name], pricetable1.[0-100g] FROM pricetable1 WHERE (((pricetable1.[Postage Name]) = strParcelType))"
Case 101 To 250
intCost = DoCmd.RunSQL "SELECT pricetable1.[Postage Name], pricetable1.[101-250g] FROM pricetable1 WHERE (((pricetable1.[Postage Name]) = strParcelType))"
Case 251 To 500
intCost = DoCmd.RunSQL "SELECT pricetable1.[Postage Name], pricetable1.[251-500g] FROM pricetable1 WHERE (((pricetable1.[Postage Name]) = strParcelType))"
Case 501 To 750
intCost = DoCmd.RunSQL "SELECT pricetable1.[Postage Name], pricetable1.[501-750g] FROM pricetable1 WHERE (((pricetable1.[Postage Name]) = strParcelType))"
Case 751 To 1000
intCost = DoCmd.RunSQL "SELECT pricetable1.[Postage Name], pricetable1.[751-1000g] FROM pricetable1 WHERE (((pricetable1.[Postage Name]) = strParcelType))"
Case 1001 To 1250
intCost = DoCmd.RunSQL "SELECT pricetable1.[Postage Name], pricetable1.[1001-1250g] FROM pricetable1 WHERE (((pricetable1.[Postage Name]) = strParcelType))"
End Select

Me.txtEstimate = strParcelType & intCost

many thanks to any gurus who can point me in the right direction or show me a easier way to do this